Got Plex Pass - but if selecting "CAST" to Sonos, it says I need upgrade

Server Version#: latest version on NAS
Player Version#: latest version on Android

I am running latest Plex Media Server on NAS. It works fine
I am running Plex service in Sonos App. it works fine.
I have Plex Pass (monthly subscription), bought via Plex App via Desktop PC

However, when I use the Plex App (latest version) on my Android Phone, and I want to Cast to Sonos, it says “I need to upgrade”, but I already have Plex Pass. In the Plex App on my Mobile, it shows that I have Plex Pass, but still I cannot select “Cast to Sonos”

I tried everything, installed Plex App again, re-authorized, etc… but no resolution

Please your support how I can use the Plex Pass and make it cast to Sonos. That was the reason for buying the Plex Pass.

thanks

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