I just done this: B2 Settings/Maintenance/ScanBluetooth push button.
Powerbeat pods, an Apple accessory, hold on button until flashes, I.e. in Bluetooth pairing mode, wait a while.
On B2 Powerbeats read on front panel, needs lastest WiFi upgrade, that’s why I didn’t see the display before!
Then says connected but no sound.
B2 cog, bottom line, Bluetooth, see Powerbeats with Output, should be ticked already, I didn’t click here, see also “unpair” beside it, leave it!
Go B2 speaker selection under Sonos title, on the B2, leave Sonos App closed, not required.
Key move coming up....select Brennan speakers, and Powerbeats plays! Total time with mistakes to get this right was 15 min. Turned off and on and still works. Great new addition.