Can't set single app mode on Apple TV

I need to set Single App Mode on an Apple TV 4K, therefore just network connection is there.


Using Configurator 2 I select the Apple TV and then click Prepare


Options selected are: Manual configuration; supervise devices; allow devices to pair. Do not enroll in MDM

Click prepare and confirm erase


Device inits restore procedure, Configurator displays "preparing.. " dialog

Apple Tv starts configuration procedure


- after configuration is done dialog "preparing... " is still there and won't go away

- click cancel on Mac to dismiss dialog (sometimes waited 10 minutes for it to go away)

- Apple Tv is not paired anymore and won't show up among supervised devices


Also tried to restore Apple TV to factory settings and immediately after restore start procedure, bu same results.


Did anyone have success in preparing an Apple TV 4K and setting Single App Mode via network ?


Had same results with tvOS 11.3, 11.4 and 12 (beta 8 and 9)