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Some TVs always do that when they see the IR signal.
Some people have put tape over IR receiver on TV
others have setup another universal remote to control TV volume and used another TV brand setup with the Playbar so that the TV won't recognize that IR.
What is the exact message? If it's an annoying popup message about the TV using external speakers (or maybe that internal speakers are disabled), then the second half of these instructions worked for me on a Samsung TV:
I solved the problem by disconnecting the tv speakers inside the unit. Remove the back (10 screws); speakers unplug from circuit board very easily; reinstall the back. Set the TV Menu to INTERNAL SPEAKERS. Since the TV thinks it is using its own speakers, you get no message. Sonos sounds terrific and works perfectly with the remote.
Really simple solution....Have the SONOS BEAM learn a Samsung sound bar remote (vol up/vol down). If you are using an Apple TV have it also learn the SAMMY Sound bar Up/Down commands....works like a charm...not message
If you are using PLAYBAR or PLAYBASE this might help. At least for my BEAM, when using the HDMI connection to the TV, my SAMSUNG TV does not flash the annoying message, but there is a message from BEAM indicating the current Volume.