Can't play Tidal tracks in Plex Media Server web interface

Server Version#: Version 4.100.1
PMS is on ReadyNAS 426
Using Microsoft Edge browser in Windows 11 to access PMS web interface

In addition to being able to play all local tracks I can also play Tidal tracks if I select Music on Tidal down left side of menu

If I add either a Tidal album to my library or a Tidal track to an existing Plex playlist, neither will play from within my library. I get following message

An error occurred trying to play this item. Please make sure content from TIDAL is not already playing on another device.
Error code: h4 (Not Supported)

However Tidal albums and tracks play via Windows 11 PlexAmp app (from my own library as well as via Tidal music), although shows as aac and also on iPhone and iPad

Why wont these Tidal tracks copied to my Plex library not play in the native PMS web interface in Windows 11

Thanks
G

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