Time Machine backup to Passport for Mac
When I restarted my Mac recently, the following message appeared and reappears every time I log in: "Time machine couldn't back up to My Passport for Mac. Files can't be copied onto the backup disk because it is read-only."
I have a 2017 iMac with OSMonterey version 12.3.1.
What can I do to fix this?
iMac 21.5″, macOS 12.3