macOS 11.6 app store login fails
I recently "upgraded" to macOS 11.6 from 10.14.6
The App Store doesn't work. When I try to sign in, it seems to work but "Sign In" still appears in the lower left corner of the window.
If I try to download a app, say Keynote, the progress indicator just spins and nothing happens.
In System Preferences, Apple ID, everything seems fine.
If I try to login to Music, it accepts my email/password and loops back to the login dialog immediately.
Any ideas?
Mac Pro