Just in case you didn’t do this….
Hopefully, you removed the Beam and any bonded speakers (i.e. surrounds and/or sub) via the Sonos app from the room in which you set up your new Playbar before moving it to the bedroom.
Once removed the Beam and any other associated speakers show as unused in the Sonos app allowing you to start the setup process again (starting with the Beam).
If you didn’t do the above you’ll have to factory reset the speakers. If you did do the above then there is something else afoot. I’d look at my network first.
Submitting the diagnostic was a good idea. You may want to call Sonos tech support vs waiting for a community moderator to see your post.