OS 11.3.1 Music has de-authorized a lot of my songs

See If you forgot your Apple ID - Apple Support and If you forgot your Apple ID password - Apple Support.

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Chazwm Said:

"OS 11.3.1 Music has de-authorized a lot of my songs: I haven't used iTunes or Music in a long time. Now I'm not able to play a lot of my songs as they are no longer Authorized. Is there a solution? I can't remember my old IDs and passwords."

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Try Reauthorizing it:

Deauthorize, then Authorize the Mac mini. This is performed in Authorizations of the Account menu.

Chazwm Said:

"OS 11.3.1 Music has de-authorized a lot of my songs: This worked fine once I found out that it the Account tab is in the Music app. Thanks“

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👍 You are welcome.