PlexAmp and Samsung Smart TV

Server Version#:1.28.0.5998
Player Version#:4.11.2
I put on my Android Tablet (Galaxy Tab S7+) the Plexamp app.
I tried to cast my music to my TVs
I have 4 smart TVs: 3 Samsung (Qn90D, QN90A, CU 7100) and a TCL (Android TV) all connected to my home WiFi.
The Plexamp sees only the TCL TV as a player and I can play my music on the TCL TV from my Tablet.
But all 3 Samsung TVs are not seen.
Is there a general problem with Plexamp and Samsung TVs ?
is it fixable ?
Thanks

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