My Windows 11 and Android device both show the same issue; “Can’t Browse Music”. Everything else works fine. My wife has an Iphone and she has no issues using the system. Once she selects music my devices can then control the Sonos app as far as playing or adjusting the volume; just can’t pick any music from the Amazon Unlimited library.
I have un-installed the Sonos app and re-installed it several times. I have removed the Amazon Music service from Sonos and added it back… several times. I have reset the Sonos App and then removed and added back the Amazon Service.
Not sure what else to do at this point.