[Samsung Galaxy Note 8 ROMs, Kernels, Recoveries, &] TheRealModder:
Anyone have successfully patch Secure Folder on Q?

I tried with SmaliPatcher but i think it failed. [build.prop + service.jar patched, knox lines on floating_feature.xml is added]

09-05 09:01:09.325 2833 3261 E BufferQueueProducer: [com.osp.app.signin/com.samsung.android.samsungaccount.authentication.ui.check.user.UserValidateCheck$UserValidationPopupActivity$_7904#0] disconnect: not connected (req=1)
09-05 09:01:09.338 2833 3261 E BufferQueueProducer: [com.osp.app.signin/com.samsung.android.samsungaccount.authentication.ui.check.user.UserValidateCheck$UserValidationPopupActivity$_7904#1] disconnect: not connected (req=1)
09-05 09:01:09.467 2876 19699 E keymaster_tee: [[31mERR[0m] (knox_secure_db.cpp:1663) DELETE error(-917)
09-05 09:01:09.470 2876 19699 E keymaster_tee: [[31mERR[0m] (knox_secure_db.cpp:1742) execute_command error -917
09-05 09:01:09.500 2833 7022 E BufferQueueProducer: [com.sec.android.app.launcher/com.sec.android.app.launcher.activities.LauncherActivity$_7633#0] disconnect: not connected (req=1)
09-05 09:01:09.548 3225 9048 E DEVROOT#Service: [1.1.44] Type = [1] , Ret = [-10010]
09-05 09:01:09.557 3225 9048 E UserManagerService: Failed in DRK check
09-05 09:01:09.565 17398 19696 E CreateProfileTask: CreateProfileTask run. com.samsung.knox.securefolder.setupwizard.provisioning.ProvisioningException: user creation failed
09-05 09:01:09.565 17398 19696 E CreateProfileTask:	at com.samsung.knox.securefolder.setupwizard.provisioning.task.CreateProfileTask.run(CreateProfileTask.java:79)
09-05 09:01:09.565 17398 19696 E CreateProfileTask:	at com.samsung.knox.securefolder.setupwizard.provisioning.AbstractProvisioningController$ProvisioningTaskHandler.handleMessage(AbstractProvisioningController.java:163)
09-05 09:01:09.565 17398 19696 E CreateProfileTask:	at android.os.Handler.dispatchMessage(Handler.java:107)
09-05 09:01:09.565 17398 19696 E CreateProfileTask:	at android.os.Looper.loop(Looper.java:237)
09-05 09:01:09.565 17398 19696 E CreateProfileTask:	at android.os.HandlerThread.run(HandlerThread.java:67)
09-05 09:01:09.566 3225 9049 E KnoxMUMContainerPolicy: no ongoing provisioning
09-05 09:01:09.567 3225 9049 E KnoxMUMContainerPolicy: no ongoing provisioning
09-05 09:01:09.601 17398 17398 E KnoxNameSetting: Creation failure : -1
09-05 09:01:09.653 3225 3285 E WindowManager: win=Window{8321b0c u0 com.osp.app.signin/com.samsung.android.samsungaccount.authentication.ui.check.user.UserValidateCheck$UserValidationPopupActivity EXITING} destroySurfaces: appStopped=false win.mWindowRemovalAllowed=true win.mRemoveOnExit=true win.mViewVisibility=0 caller=com.android.server.wm.AppWindowToken.destroySurfaces:1199 com.android.server.wm.AppWindowToken.destroySurfaces:1180 com.android.server.wm.WindowState.onExitAnimationDone:5030 com.android.server.wm.WindowStateAnimator.onAnimationFinished:287 com.android.server.wm.WindowState.onAnimationFinished:5471 com.android.server.wm.-$$Lambda$yVRF8YoeNdTa8GR1wDStVsHu8xM.run:2 com.android.server.wm.SurfaceAnimator.lambda$getFinishedCallback$0$SurfaceAnimator:100
09-05 09:01:09.655 17398 17398 E KnoxLog : showErrorDialog() : Failed to create Secure Folder.

You can check the full log here : Google Drive