Hi, There's a similar discussion
here and in other threads around the community regarding using Sonos Ones with the Playbar for Airplay 2. It's the main speaker in the home theater room that determines Airplay 2 compatibility, in this case, the Playbar, which is not available as a target for the Airplay 2 stream. The reason for this is because the main speaker is the one that does all the heavy lifting and handles controlling what audio is sent to the other players in the room. If you had a Sonos One, you could send the Airplay 2 signal to it and group (not bond as surround speakers) the Sonos One with your Playbar, and they'd play the same audio at the same time.
The Amp you have, when used as a surround player, doesn't make the Playbar compatible with being sent an Airplay 2 signal.
Also, you can always set up a music library share from a computer or NAS drive with Sonos, then you can play those tracks using the Sonos app without having to use Airplay 2 at all. That would work on any Sonos player.
