I am on MacOS Catalina, and successfully changed my disk access settings per another thread, so that the below have full disk access:
SonosLibraryServer
Sonos
I indexed successfully a few times after that after adding a few albums, but today going to update the library again after only adding 1 or two albums, the Sonos desktop app hangs forever, spinning wheel, and then I have to force quit it. I let it try for over an hour this time.
I have a large library: 43766 items, 688.58GB, but the support page says: "Depending on the size of your library, the music index may take several minutes to update."
Have I exceeded the size that puts me into the “several minutes” category and bumps me to the “several hours” or “several hours and then will crash” territory? :)
Again, I have updated the library recently a few times and this does not happen. (granted it takes way longer than “several minutes.”)
Not sure if a diagnostic code reveals anything library related, but here it is anyway: 269838512.