An error occurred while attempting to play this video. Please try restarting both the Plex Media Server and this app

[Coxeroni]

All of you be sure to check if you have an issue with DNS rebinding:

AndroidTV 'new video player' uses plex.direct names in URLs and that causes name resolution errors

figured it out stuck the dnsmasq config into my router and things seem to be working what plex client should doing is doing a a plext.direct test and if it fails point me to that article

The new player checks for this and refuses to play if it can’t reach plex.direct