This seems like a very common problem. I have tried other threads here but so far none have resolved this issue.
As far as I can see this only seems to affect Android. My daughter uses iPhone without issues.
When I select Reauthorize I get a spinning pink progress bar then a white screen. It progress no further forwards.
I have uninstalled and reinstalled Sonos but to no avail. I have an Oppo A74 5G running Android 11, I also tried my older device running Android 8.1.0 but that now exhibits the same issue.
My Sonos system is up to date and contains 3 other speakers 2 Play:1’s and a Play:3. I’m using Sonos S2.
Any help would be very welcome otherwise this speaker is junk.