"Genius Results Can't be Updated" / iTunes Match not syncing new songs on Apple Music

I am running Sonoma 14.4.1 on a MacBook Air M2.

I recently used my SuperDrive to load a few CDs of mine into Apple Music.

Those songs are now in my Mac's music library.

However, when I try to Sync Library, it tries for about 5 -7 minutes before saying "Genius Results can't be updated right now. An unknown error occurred [4007].

Consequently, I can't play these songs on my iPad, iPhone, etc.

FWIW, I don't use a VPN, have no trouble accessing the network through Safari and other apps, so I doubt network connectivity is the issue.

Any ideas?