Hi @Virgil,
That’s how I’d recommend connecting those devices, everything should go into the TV as it will be able to process and send the appropriate audio signals to the Sonos Beam.
In the Diagnostic the surrounds are operating on 2.4Ghz, when they should be on 5Ghz. A reboot would help resolve this and get them back onto 5Ghz unless your router settings have been adjusted. If you power the Beam and surround speakers off for a few minutes, then power them back on, with the Beam being powered on first, do you get surround sound using the Xbox or BT Box?
It’s a very strange issue, usually you would get no surround audio or you would get surround audio, rather than a split. If the settings on the Xbox and BT Box are set to Surround instead of Stereo and a reboot doesn’t resolve this, I’d suggest reaching out to our support team as they have to tools necessary to troubleshoot this issue.
I hope this helps!