"You cannot change the music library at this time because the current library is in use by a device. Sign in without connected devices to change your music library."
I can't access my 2nd MUSIC library since upgrading my iMac to Monterey. This error message comes up despite me having done all of the things recommended in the many complaints on line. Is there really not some workaround available ??
iMac 21.5″, OS X 10.11