Uh oh! There was an error adding Trello to Slack.
Asked by Kenneth Kron:

Whenever I attempt to add the Trello app to slack I end up at the following URL

<https://trello.com/integrations/add-to-slack-error>

Uh oh! There was an error adding Trello to Slack.

If I go to the members section of Trello and try to add Slack integration I get the same result no details anywhere.


Answers:
author: Richard Bramwell
body: Revoking worked for me however not in the way I thought, as I have several Trello administrators on my Trello Workspaces.  

The good news is it cleared down the blockages and using the original Trello Administrator account I was able to link several boards ( not sure if there is an upper limit)   

I hope tis helps


author: Duc Do Xuan
body: I get same issue as people above. Although I use some difference browsers: microsoft edge, chrome, safari and also use incognito mode but still got same error without any reason.


author: Koos
body: I was experiencing the same problem and found that I couldn't connect the integration in Firefox. Not even with Enhanced Tracking Protection and uBlock Origin disabled. Using Chrome, the instructions above worked.


author: Garrett
body: Hi everyone!

We've had a few users report that the issue only occurred in a specific browser and switching to another helped them authorize successfully. Specifically, **Brave's** shield feature seems to be breaking the authorization, although the issue could be a similar ad-blocker feature in other browsers.

If you're still experiencing trouble, I'd suggest giving these troubleshooting steps a try:

First, check if your browser is fully up to date: [What browsers and mobile platforms does Trello support?](https://help.trello.com/article/735-what-browsers-and-mobile-platforms-does-trello-support)

After confirming you're on the latest version, try authorizing the app following each of the steps below:

* Disable all extensions and customizations in your current browser
* Try using Incognito or Private browsing mode
* Try using a different browser on the same computer
* Try using a different computer

When trying to authorize the app, please use the steps Lara shared previously:

1. In Slack, type in the command */trello unlink* and */trello reset*.
2. Go to your Workspace page in Trello
3. Scroll down to the Slack linking section
4. Select Add to Slack
5. Follow the authorization steps

If the issue persists, send us a message over at <https://trello.com/contact> and we'll be happy to take a closer look with you. Just be sure to include what browser and OS version you attempted this with.


author: Yad Ghavi-Helm
body: Hello,

I have the same issue, and it didn't resolve after following your suggestions.

I'm using Firefox - could this be the issue?

Yad


author: Lara
body: Hi Kenneth,

Thanks for reaching out!

Let's try starting with a clean slate to see if that helps get Slack working again. Would you mind trying the following steps for me please?  

1. Go to the board where this Power-Up is enabled.
2. Open the Board Menu and select the Slack Power-Up.
3. Select **Remove personal settings** and **Disable** the Power-Up.
4. Go to <https://trello.com/my/account>
5. Under the Applications section, select Revoke under any entries for Slack (if any are found).
6. In Slack, type in the command */trello unlink* and */trello reset* and reauthorize your account.

After that, go ahead and reenable the Slack Power-Up and follow the authorization flow. Could you let me know how that goes please?

I'll keep an eye out for your reply,

Lara  
The Trello Team

comments: author: ???
body: i have same trouble with slack power-up.

and i have done all of that you recommended.

but nothing's change.

still every time i add slack team in trello, it ends up with

<https://trello.com/integrations/add-to-slack-error>

i need profer help.


author: Lara
body: Hi there,

Could you please go to your Workspace settings page and unlink the Slack team?

![Image 2021-08-23 at 1.28.49 pm.png](https://community.atlassian.com/t5/image/serverpage/image-id/157068i6EB70FC4C4961531/image-size/large?v=v2&px=999 "Image 2021-08-23 at 1.28.49 pm.png")

If there is no Slack team linked, please click **Add to Slack**:

![Image 2021-08-23 at 1.30.57 pm.png](https://community.atlassian.com/t5/image/serverpage/image-id/157069i397DC7CBC59997E9/image-size/large?v=v2&px=999 "Image 2021-08-23 at 1.30.57 pm.png")

If the issue persists, please reach out at <https://trello.com/contact> and we can take a closer look.

All the best,

Lara  
The Trello Team


author: vincent
body: Hi Lara,

I get the same issue as the people above. I followed your latest instructions but still get the same error:

<https://trello.com/integrations/add-to-slack-error?error=State-Check-Failed>

![Screen Shot 2021-08-24 at 8.38.06 PM.png](https://community.atlassian.com/t5/image/serverpage/image-id/157328i5AA3A3D8C5C2ACF5/image-size/large?v=v2&px=999 "Screen Shot 2021-08-24 at 8.38.06 PM.png")

This error also showed when unlinking the authorized Slack workspace and then trying to link again.

Thanks,


author: Lara
body: Hi Vincent,

Are you able to link the Slack team via your Workspace settings page?

![Image 2021-08-24 at 4.40.15 pm.png](https://community.atlassian.com/t5/image/serverpage/image-id/157402iEC09C6BBE2849F55/image-dimensions/271x347?v=v2 "Image 2021-08-24 at 4.40.15 pm.png")

If not, please reach out via <https://trello.com/contact> so we can take a closer look. Thanks!

Lara  
The Trello Team


author: vincent
body: Hi Lara,

Unfortunately, I get the same error page and message as above when I click on the 'Add to Slack' button:

![Screen Shot 2021-08-25 at 2.56.23 PM.png](https://community.atlassian.com/t5/image/serverpage/image-id/157451i2FC74FD8F41D6B22/image-size/large?v=v2&px=999 "Screen Shot 2021-08-25 at 2.56.23 PM.png")

I guess I'll trying contacting your support through the link you provided above then.

Vincent


author: vincent
body: Hmmm actually the link you provided <https://trello.com/contact> seems to be broken too...


author: vincent
body: OK I found the culprit in my case !   

I switched to the **Brave browser** recently, which is based on Chrome, but has some tweaks to block some requests that it deems inappropriate.

Out of curiosity I switched back to the **Chrome browser** to try adding Slack, and this time it worked.

Hope this helps other people,

Vincent from [Vnited](https://vnited.co)


author: Garrett
body: Hey [@vincent](/t5/user/viewprofilepage/user-id/4528434) thanks for the update! I saw a similar report from someone using Brave and they were able to successfully connect Slack by using another browser temporarily.

I'll share another comment suggesting some browser troubleshooting steps for other affected users.


Tags: slack