yashsingh1/xdaforums huggingface dataset:
[OnePlus 3T Guides, News, & Discussion] mandarpalshikar:
I was on OOS Beta 15 with Magisk 14 and TWRP 3.1.1-2

Here is what worked for me to correctly flash OOS Beta 16 with SuperSU

reboot in recovery (TWRP)

flash 3.1.1-0 TWRP

Reboot in recovery (TWRP)

Wipe Dalvik and Cache

Flash OOS Beta 16

flash SuperSU 2.82 SR3

Wipe Dalvik and Cache

Reboot into System

Reboot in recovery to check TWRP is working

install UPDATE-suhide-v1.09-20171001222116.zip from "https://xdaforums.com/apps/supersu/suhide-lite-t3653855"

reboot into system

If getting DM-verity warning then fire command in adb on pc - adb reboot "dm-verity enforcing"

Thanks for the oreo update and nice info on how to update.

Regards,

Mandar
[OnePlus 3T Guides, News, & Discussion] Siddk007:
Nadeon

---------- Post added at 04:54 AM ---------- Previous post was at 04:52 AM ----------

1.Nova launcher

2.Nadeon icon pack

3.Play video in YouTube, minimise 2-3 times (to homescreen and video), it started working for me.
[OnePlus 3T Guides, News, & Discussion] sanjeev7:
Can u attach the super user u used.??
[OnePlus 3T Guides, News, & Discussion] edukastillo:
Thank you bro, and what about those widgets (clock and weather)?
[OnePlus 3T Guides, News, & Discussion] Siddk007:
Today weather
[OnePlus 3T Guides, News, & Discussion] :
Use magisk beta, latest is 14.3 I guess.

---------- Post added at 05:23 AM ---------- Previous post was at 05:21 AM ----------

Same here. I'm unrooted, pitch black nor swift black does anything to the grey QS background. The themes need to be updated for OOS. Wait for it.
[OnePlus 3T Guides, News, & Discussion] mandarpalshikar:
Here you go.
[OnePlus 3T Guides, News, & Discussion] sanjeev7:
Successfully Booted to OREO.... Without Encryption... without data loss

Flash TWRP (OREO) provided in OP

Flash ROM

Flash Super user (the one in OP) if u skip this step...u will be encrypted

Reboot

Reboot may take some while...it took 12-15 mins for me...enjoy OREO with root :)
[OnePlus 3T Guides, News, & Discussion] Funk Wizard:
I hope you are using Akhil's twrp

I will update the flashing instructions again as we now have the force encryption disabler so you can try again

Or if nothing works you can flash the ROM via stock recovery then flash twrp and flash SuperSU SR5 from the download section.
[OnePlus 3T Guides, News, & Discussion] Funk Wizard:
Thanks for confirmation buddy :fingers-crossed:
[OnePlus 3T Guides, News, & Discussion] adwaitatre:
I am getting errors while updating

updater process end with error 7

How to solve it?
[OnePlus 3T Guides, News, & Discussion] jokerpappu:
flash the twrp in the 1st page provided by op epecially for oreo and flash the zip again
[OnePlus 3T Guides, News, & Discussion] mihata:
What is your device certification status for Google Play Store with latest Oreo beta?
[OnePlus 3T Guides, News, & Discussion] vahtmestar:
Mine is certified and safetynet passes.

Lähetetty minun HUAWEI M2-A01L laitteesta Tapatalkilla
[OnePlus 3T Guides, News, & Discussion] habylab:
SR5, from the beta thread. Linked here several times.
[OnePlus 3T Guides, News, & Discussion] Jesusnagler:
Sorry, but I think it is not clear that beta 16 works when I come from 4.5.0.

I think I must flash the new TWRP, wipe cache, data, system, flash SuperSU (Magisk is not working) and reboot.

???
[OnePlus 3T Guides, News, & Discussion] ben_pyett:
Thanks, I daftly wasn't using the specific linked Oreo TWRP build, my bad, although whilst this version of TWRP enables me to flash the Oreo zip from TWRP without error.

But I've still got two issues:

1)

Unfortunately, I'm still getting stuck on boot if I flash the SuperSU (SR5 as per new OP link), even after clearing cache etc, device sticks on 1+ POWERED BY android screen, so doesn't even really boot, no animation The ROM boots fine without SuperSU, so something must be going wrong with the application of ROOT. After some people mentioned that it took a while (ie 10-15 minutes), I left mine longer, in case it was a timing issue, but even after 30mins mine is still stuck there, also adb logcat gets nothing. Device getting very warm.

EDIT1 - UPDATE1

After removing previous magdisk and supersu content from /data and switching to SR3 superSU I'm successfully root

EDIT3 - UPDATE3

Most annoyingly though, the SuperSU application suggested that I update my SU binary and when I did my device boot looped - AgghH!! I was able to re-apply stock boot.img and then flash SR3 and booted ok. (:confused:) avoiding SR5!

2)

I also notice that if I don't apply superSU and just boot OREO from TWRP when I return to recovery, its back to stock, whats happening there, how comes the new TWRP wont stick or is this expected ?

EDIT2 - UPDATE2

After resolving the initial root issue, TWRP now sticks :)

Any ideas or suggestions, Anyone? apart from to not root.
[OnePlus 3T Guides, News, & Discussion] Tagtag123:
Installed ob16 over ob15

Battery is good so far. Can't run PiP at all (obviously i have enabled it). Should i clean flash? I really don't want to set it up again.

Also, is there any pixel like theme for ob16?

Or can we change the accent colour?
[OnePlus 3T Guides, News, & Discussion] mandarpalshikar:
Use SR3 and it will work.
[OnePlus 3T Guides, News, & Discussion] Vampire_copper:
Im on h2os, leaked version 8.0.0 .

How do i go to oxygenos beta 16?
[OnePlus 3T Guides, News, & Discussion] zoOMito:
You prefer i explain in a full text or just read at least the OP?
[OnePlus 3T Guides, News, & Discussion] Pozas:
I think this has not been answered yet. Can anyone confirm whether private data (IMEI, MACs, phone numbers...) Is still being sent to OP or not?
[OnePlus 3T Guides, News, & Discussion] Midomad:
Can you please search/read the thread since this has been already answered!?
[OnePlus 3T Guides, News, & Discussion] afarnedi:
notification counter and PIP?

hi all! I've installed beta 16 from beta 15. I'm missing a couple of things:

1) notification badge counter (i know I can use nova prime but with oreo launcher seems veeeery smooth)

2) PIP; I don't even know what to expect from this feature but I guess it could be useful sometime. Of course pip it's ON in settings

amy help appreciated.

andrea
[OnePlus 3T Guides, News, & Discussion] Siddk007:
Both the features u mentioned working fine for me
[OnePlus 3T Guides, News, & Discussion] Funk Wizard:
Guys just a quick one, please keep in mind that this is the first Oreo beta and bugs are expected. I would appreciate if all of you can report via proper channel rather than just rant about what's not working.

Thanks for your support and participation, there is lot more to come :highfive:

Stay tuned :fingers-crossed:
[OnePlus 3T Guides, News, & Discussion] Laapander:
Added Notification dots in Launcher

What this means?

iOS style notification badge next to app icon??
[OnePlus 3T Guides, News, & Discussion] jamiexx:
Cannot install Magisk. Both Stable and Beta versions never reach boot animation.
[OnePlus 3T Guides, News, & Discussion] tabish84:
I was on freedom 2.12 which was based on our 4.5.0. I dirty flashed the rom and the PIP option is not working for me. What might be the problem here?
[OnePlus 3T Guides, News, & Discussion] Midomad:
Indeed.

Did you read OP?
[OnePlus 3T Guides, News, & Discussion] Vampire_copper:
In op its given for beta 15 to 16 , and even for 16 to 15. But not for h2os to oxygenos.

Can u explain how to?
[OnePlus 3T Guides, News, & Discussion] Simba83:
Anyone come from experienceos to this? Does a dirty flash even for us?

Skickat från min ONEPLUS A3003 via Tapatalk
[OnePlus 3T Guides, News, & Discussion] tabish84:
Yup i read it and now i will read it again. Must have missed something
[OnePlus 3T Guides, News, & Discussion] Midomad:
Reboot to compatible TWRP

Wipe Dalvik , System, Data & Cache(clean flash)

Select ROM Zip and Swipe to Flash

Flash SuperSU

Reboot to OS
[OnePlus 3T Guides, News, & Discussion] iGamesMaximus:
Hi, when I flash in op 3T beta 16 and its SR5, then I say install, I wait 1 hour and I always say install = never finished installing ... how to fix it? When I use the hard reset, it resets the default stock recovery. flashing retry twrp try to retry flash and the same problem (error) ... I need Android 8 only with root = no root oreo never. please, how to solve it? I have tried everything and I still do ... :(
[OnePlus 3T Guides, News, & Discussion] El-Lobo68:
Have no problems what I do is....

Compatible TWRP flashing

Full wipe , system,data,cache,dalvik/art

Then flashing fullzip OB16

Reboot into recovery compatible TWRP

Flashing SuperSU SR5

Wipe cache/dalvik

Reboot system and all is fine....
[OnePlus 3T Guides, News, & Discussion] sorinsoso:
Ok. All works very good for me.

I install Oreo over Beta 15.

I download Oreo from official OnePluse site.

1. Go in TWRP.

2. Wipe Dalvik/ART Cache and Cache

3. Install ROM from internal memory

4. Intsall SR3-SuperSU-v2.82-SR3-20170813133244.zip

5. Reboot System.

6. Enjoi.

All work fine and is rooted.
[OnePlus 3T Guides, News, & Discussion] The Apostle:
LMAO... Stop enabling these cucks. ?

OB16 is excellent so far. No issues at all for me. Haven't tried BT yet though. Battery life had been tremendous on first cycle.
[OnePlus 3T Guides, News, & Discussion] sorinsoso:
Thanks

That SuperSu its work. Thank you.
[OnePlus 3T Guides, News, & Discussion] drsudarshanbk:
My banking apps not working on OREO update beta 16.

Play store also showing my device as UNCERTIFIED.

my device have oreo compatible Twrp, unlocked bootloader & non rooted oreo
[OnePlus 3T Guides, News, & Discussion] lombyzgz:
Four colums with stock?

Enviado desde mi ONEPLUS A3003 mediante Tapatalk
[OnePlus 3T Guides, News, & Discussion] jamiexx:
Yes? I don't see your point - I'm just reporting the fact that Magisk doesn't work. Not willing to install a chinese root solution on my phone either, so as I said, I don't see your point.
[OnePlus 3T Guides, News, & Discussion] jd1001:
Any know if the advanced notification controls are available? The ability to have more control over notifications? It used to be available by holding the settings wheel on quick settings.

Battery life is immense so far!

What I am trying to ask for is power controls. Anyone know if it is available?
[OnePlus 3T Guides, News, & Discussion] neinfricatu:
System/vendor/etc
[OnePlus 3T Guides, News, & Discussion] counterfeit187:
IT'S ALREADY BEEN MENTIONED ABOUT 50 TIMES, THERE IS NO NEED TO REPORT. IT IS ALSO IN THE OP (second post actually r/mildlyinfuriating) AND THE RECOMMENDED SUPERSU IS LINKED.

Oh and make sure you uninstall magisk before updating rom and flashing SuperSu so you don't have any conflicts or errors.
[OnePlus 3T Guides, News, & Discussion] Midomad:
You're asking for Magisk and it's clearly mentioned on OP that Magisk 14.2/14.3 is not working on OB 16 for now,so no need to clutter the thread.
[OnePlus 3T Guides, News, & Discussion] lombyzgz:
I install Oreo over 4.5.0 and now all my phone are encrypetd....sad, i know im idiot..

1. I instal twrp modifed,

2. Reboot twrp

3. wipe dalvik/cache

5. Install rom oreo

5. Install supersu SR3.

6. reboot system

7.... encryptation twrp and oss...

any solution for no data loss?..
[OnePlus 3T Guides, News, & Discussion] kedar18:
Ditto...
[OnePlus 3T Guides, News, & Discussion] ishanp:
Guys, reporting from Oneplus 3 A3003 here. Magisk can be made to run if SELinux enforcement is disabled('Permissive'). Unfortunately the simple bootloader command to disable it has been recanted (security risk), on the A3003 you have to Downgrade bootloader->Disable SELinux enforcement->Upgrade bootloader->Install. I got Magisk and Viper4Android to run with this.

Reference:https://xdaforums.com/oneplus-3/how-to/oxygenos-beta-19-oneplus-3-t3631062/page31

I am reporting here so you guys can find and apply a comparable solution for the 3T

WARNING: VERY HIGH RISK OF LOSING 100% OF YOUR DATA. AN INCOMPATIBLE BOOTLOADER CANNOT DECRYPT YOUR FILES. DO NOT ATTEMPT UNLESS AN EXPERT.
[OnePlus 3T Guides, News, & Discussion] uttam.ace:
Considering its a first OREO beta build , Battery is awesome , here is screen with first charge cycle
[OnePlus 3T Guides, News, & Discussion] sorinsoso:
Enter in Fastboot. Flash compatible recovery TWRP with ADB. Install Oreo again and supersu. After reboot messeg that encrypt its apear again but phone will boot and all will work good.
[OnePlus 3T Guides, News, & Discussion] lombyzgz:
Thanks i flash twrp oreo and twrp blue_45 and encryptation with fastboot and nothing... I format userdata...
[OnePlus 3T Guides, News, & Discussion] sorinsoso:
You have to used normal compatible recovery twrp, not blue. Its work for me.
[OnePlus 3T Guides, News, & Discussion] Viktorrr:
Half day of active using of beta 16 - no issues have been found. All base functions including bluetooth are working well, nfc not tested yet. Battery is OK as well. Overall the build seems pretty much stable.
[OnePlus 3T Guides, News, & Discussion] jamiexx:
When have I asked for anything? Just said it doesn't work, no need to get so triggerred.

In any case. I'm currently looking into the boot image conflicts and trying to fix them - I have managed to get to boot, but it's still bootlooping. I will post a beta repo on GitHub later once I fix the bootloop, so people can actually use Magisk.
[OnePlus 3T Guides, News, & Discussion] Midomad:
It has been already said many times, there is no need to mention it.it's stated on OP too

Good luck
[OnePlus 3T Guides, News, & Discussion] jamiexx:
Thanks mate.
[OnePlus 3T Guides, News, & Discussion] drdionysius:
I can't find a mention about magisk anywhere in the original post... I'm happy I read this here and it should be in the op.

Edit: I just read it's in the second post.
[OnePlus 3T Guides, News, & Discussion] Midomad:
Read post #2
[OnePlus 3T Guides, News, & Discussion] DJBhardwaj:
Can someone please point me to the URL of the OTA zip (if available)?
[OnePlus 3T Guides, News, & Discussion] mandarpalshikar:
Check here - http://downloads.oneplus.net/devices/oneplus-3t/
[OnePlus 3T Guides, News, & Discussion] ufokomar:
how activate auto call recording ?
[OnePlus 3T Guides, News, & Discussion] ben_pyett:
Super Su

Anyone worked out why A Sr3 works and SR5 doesn't?
[OnePlus 3T Guides, News, & Discussion] Pharrax:
Sr5 works for me
[OnePlus 3T Guides, News, & Discussion] ben_pyett:
I've read that else where in the thread.. But certainly doesn't for me.....

Simple flash of SR5 after oreo, leaves me at powered by android screen forever.

Oreo and SR3 boots just fine.

Worse is if I try to update from working Oreo & SR3 to SR5 I'm left hanging at boot animation.. For eternity.

l need guidance.

Just a guess, but figure there must be something in my /data that's not right....

There used to be unSU type zips but I've tried running them and they don't help.

I'm jump to the super Su thread to see if anyone's the wiser
[OnePlus 3T Guides, News, & Discussion] isthatxavier:
Thanks, Ive done it. I reverted back because I was not getting LTE. Also, I was getting a system message that my data had run out which wasn't the case. I've seen another user on the OnePlus forum having the same bug.

Now, problem is that I reverted back with the special build. And I'm still not getting LTE. It would connect to 2G, 3G but 4G LTE.

System message won't show up anymore saying that my data had run out and to contact provider, I can connect but to LTE. I've tried with Beta 15 and OOS 4.5

This is the other user having the same issue. What would you suggest me to do?

https://forums.oneplus.net/threads/no-data-after-oreo-8-0-update-beta-25-op3.656131/
[MENTION=230517]FuNk[/MENTION]wizard
[OnePlus 3T Guides, News, & Discussion] The Apostle:
It was mentioned several pages back. The original SR5 file was system mode, not systemless. I used SR5 right from chainfire website and all went smooth.

---------- Post added at 09:56 PM ---------- Previous post was at 09:54 PM ----------

^^^^^^^ Link above^^^^^^^
[OnePlus 3T Guides, News, & Discussion] lombyzgz:
With this app

https://play.google.com/store/apps/details?id=net.jroot3d.joneplustools

Enviado desde mi ONEPLUS A3003 mediante Tapatalk
[OnePlus 3T Guides, News, & Discussion] ufokomar:
Thx works fine :)
[OnePlus 3T Guides, News, & Discussion] SergioRmz:
I have an issue with some apps being still visible once I lock my screen. Some examples are YouTube and Twitter apps, if I lock my phone using one of those apps, the lockscreen is a mess. I made a clean flash. Anybody else experiencing this?
[OnePlus 3T Guides, News, & Discussion] counterfeit187:
I was casting Google play music to Google Home and my phone would vibrate anytime the song changed or every time I exited the app and opened it again while the music played. Anyone else seeing this? It's kind of annoying, so hopefully just a temporary bug. I think there was an error message the first time I noticed it but I accidentally cleared it without reading
[OnePlus 3T Guides, News, & Discussion] hem.acharya:
Has anyone had any luck with pixel camera port app?
[OnePlus 3T Guides, News, & Discussion] edukastillo:
Hey guys, do you know why battery consumption is so high for Stand By?
[OnePlus 3T Guides, News, & Discussion] kcajith:
Can anyone confirm call record feature working in Oreo update on Oneplus 3T Open beta - 16?. I am expecting the Call record feature to be enabled in dialer just like the way it was in beta 15 or older builds.
[OnePlus 3T Guides, News, & Discussion] standbyme91:
PIP not work? have anybody have problem like me?
[OnePlus 3T Guides, News, & Discussion] NicestRudeGuy:
yeah
[OnePlus 3T Guides, News, & Discussion] nikhil.agrawal:
I think its a bug. I too have very high mobile standy specially when i use only single sim and have full lte network.
[OnePlus 3T Guides, News, & Discussion] Siddk007:
Lol, had set alarm at 8 am and it did not ring:laugh:

Can anyone else check?
[OnePlus 3T Guides, News, & Discussion] srharshajava:
Autofill is not working for me... I updated from oos 4.5 to beta 16. I enabled autofill from Google in input settings. I also selected a Google account to sync from. Is there anything I need to do??
[OnePlus 3T Guides, News, & Discussion] nikhil.agrawal:
Alarm is working for me.
[OnePlus 3T Guides, News, & Discussion] dannycardoz92:
working perfectly for me as well..Had set a scheduled power off at 12:00 and on at 7:30 and alarm at 8. Everything worked normally!
[OnePlus 3T Guides, News, & Discussion] mr.charlie:
Are you rooted on OP3T with safetynet passes? How did you do that?

I was using Magisk and therefore not getting safetynet passes anymore.
[OnePlus 3T Guides, News, & Discussion] vahtmestar:
No I'm not rooted.
[OnePlus 3T Guides, News, & Discussion] DJBhardwaj:
Thank you. But that is the full ROM zip. I am looking for the OTA zip for sideloading.
[OnePlus 3T Guides, News, & Discussion] afarnedi:
Did you make something special in settings for notification counter and pip? Or it just worked without any intervention from your side?
[OnePlus 3T Guides, News, & Discussion] sharath_babu:
it would be helpful if someone put-up how to get pip working, do we need YouTube red for working with Oreo??
[OnePlus 3T Guides, News, & Discussion] helioXverse:
From what I've read, YouTube red is required for the moment as pip requires some things app side as well as having Oreo. I have YouTube red and all I have to do is hit the home button and the small video window appears in the bottom left.
[OnePlus 3T Guides, News, & Discussion] dark_knight_95:
U are getting Google auto fill in settings?I am not
[OnePlus 3T Guides, News, & Discussion] sharath_babu:
flashed recovery.img attached in 2nd op, clean flashed ob16 , followed by SR5 attached in 2nd post..

as soon as SuperSu is flashing twrp goes full black with only notification light turned on. phone becomes unresonsive .... same case with SR3 too.

need to force reboot, at last i booted with out superSU, now twrp has been with stock recovery...

using single sim, mobile network draining much power than earlier. feedback app isn't present to report!
[OnePlus 3T Guides, News, & Discussion] vahtmestar:
When I try to go to Tapatalk via notification on lockscreen Tapatalk wonnt open thread where I got that notification. It just displays loading endlessly. Have someone noticed that same or is it just me ?
[OnePlus 3T Guides, News, & Discussion] Siddk007:
Working without my intervention!!
[OnePlus 3T Guides, News, & Discussion] afarnedi:
Lucky you! I see many user here with pip not working with no reason.
[OnePlus 3T Guides, News, & Discussion] edukastillo:
It worked for me only watching vimeo videos from Chrome. PiP for Youtube didn't work at all.
[OnePlus 3T Guides, News, & Discussion] Siddk007:
Dont get me wrong guys, i highly appreciate Oneplus for bringing Oreo this quick, but after using custom Oreo roms like Los 15, Lunux, Gzosp, Validus . OOS oreo does not give the same look and feel like a true Oreo should give. Just my opinion
[OnePlus 3T Guides, News, & Discussion] edukastillo:
Alarm working fine here :)
[OnePlus 3T Guides, News, & Discussion] Siddk007:
I just checked again, PiP works in youtube app
[OnePlus 3T Guides, News, & Discussion] edukastillo:
+1 bro. This looks like a new Nougat release

---------- Post added at 07:33 AM ---------- Previous post was at 07:33 AM ----------

Let me check again, probably it's an 8th layer issue
[OnePlus 3T Guides, News, & Discussion] sharath_babu:
you using youtube red??
[OnePlus 3T Guides, News, & Discussion] Siddk007:
Nope, the normal one. Have u enabled pip in youtube settings?
[OnePlus 3T Guides, News, & Discussion] cultofluna:
Where is PIP on YT settings?...
[OnePlus 3T Guides, News, & Discussion] CareDood:
This one seems to be working without hazzle:

GCam_4.4.012.156195200_MI5S_MIUI_Android_7.0_PIXEL_II_XL_v.1.1.apk

For the all-in-one version I could not get HDR+ auto-mode to process. Forced HDR+ worked but without ZSL. The 821-optimized version would not run.
[OnePlus 3T Guides, News, & Discussion] Sonificado:
Hey guys! Everything is working fine for me, the only one that doesn't is the PiP but i don't really care about that. Battery is better than ob15 for me also. No bugs with Bluetooth or anything. Has anybody tried the ozone substratum theme on the ob16? I hate the stock accent colors...
[OnePlus 3T Guides, News, & Discussion] Siddk007:
Lol, thats why pip not working. What is your youtube version?
[OnePlus 3T Guides, News, & Discussion] cultofluna:
12.40.59
[OnePlus 3T Guides, News, & Discussion] Siddk007:
I guess its still api21 nougat, you need api26 i.e. oreo
[OnePlus 3T Guides, News, & Discussion] srharshajava:
I cleared the data for Google play services and framework. then it appeared but it is displaying autofill passwords that i saved using lineage 15 to google cloud passwords. I was able to use them on lunux and gzosp. But here may be i need to clean flash the rom.
[OnePlus 3T Guides, News, & Discussion] cultofluna:
Hehe I'm still on beta 15 ( 7.1.1)...

This first 8.0 beta seems little bit poor to me...

I'm waiting to drop the first custom kernels & then maybe I will give a try...

Otherwise 8.0 Omni or Lunux are looking promising..
[OnePlus 3T Guides, News, & Discussion] Siddk007:
Damn man, seriously? You were using OB 15 all the while and asking for PiP! Great, simply great
[OnePlus 3T Guides, News, & Discussion] :
I absolutely agree with you. I expected more of vanilla look, but OnePlus modded the interface to look more like Nougat than Oreo. I would've liked it to be more like AOSP Oreo sine its much more streamlined in terms of keeping the relevant stuff at relevant place.

But at least its very stable.
[OnePlus 3T Guides, News, & Discussion] vahtmestar:
Remember to fill that survey on first post and mention these things there. Maybe they change that because I think exactly same way
[OnePlus 3T Guides, News, & Discussion] cultofluna:
Sorry man was just curious cause you are the only one that PIP on YT works!....
[OnePlus 3T Guides, News, & Discussion] mikey1975:
I'm on OB16, checked APKMirror, and latest youtube version there is 1240593400 -

Min: Android 5.0 (Lollipop, API 21)

Target: Android 8.0 (Oreo, API 26).

But no setting for pip to be found, which version of youtube do you have?
[OnePlus 3T Guides, News, & Discussion] Siddk007:
For everyone, having PiP enabling issue, did you give permission?

settings -> Apps -> Special access -> Picture in Picture