Solution
Repatch with the latest patches. You can verify you have the latest patches by checking YouTube Settings > Morphe > About
If you continue to have playback issues, then use Android VR sign-in and follow the instructions carefully: YouTube settings > Morphe > Miscellaneous > Spoof video streams > Android VR sign in
If you still have issues, or you want a video audio menu, then change to TV or Android Reels client in:
Settings > Morphe > Miscellaneous > Spoof video streams > Default client
Android Reels client may not work for some users.
If you still have issues then try Android Studio client.
Still having issues? Try a VPN to a different part of the world (try many different locations).

Acknowledgements
Solution
Repatch with the latest patches. You can verify you have the latest patches by checking
YouTube Settings > Morphe > AboutIf you continue to have playback issues, then use Android VR sign-in and follow the instructions carefully:
YouTube settings > Morphe > Miscellaneous > Spoof video streams > Android VR sign inIf you still have issues, or you want a video audio menu, then change to TV or Android Reels client in:
Settings > Morphe > Miscellaneous > Spoof video streams > Default clientAndroid Reels client may not work for some users.
If you still have issues then try Android Studio client.
Still having issues? Try a VPN to a different part of the world (try many different locations).
Acknowledgements