YouTube TV - NOT working on Android TV Ver 7.1

One of the MAIN reasons I purchased the Rockpi4B is for an STB for YouTubeTV.

I installed the latest Android TV 9 image without success. None of the apps appear to install from the Google Play store. Nor do installed apps update. Everything results in being stuck downloading.

I installed the previous version of Android TV 7.1 - it appears to work MUCH better - Kodi working fine, as well as others.

However YouTube TV - results in a Playback Error - Can anyone shed any light on this?

Did you try this version?
https://github.com/yuliskov/SmartYouTubeTV/releases/download/6.16.89/SYTV_Vlive_v6.16.89_r.apk

have you tried an old version of that? It is available on apknite store.