iTunes and Apple id do not match
I changed my Apple id. iTunes didn’t update the id to match new one. Old id email is no longer valid. I have 1700 songs transferred from CDs that I can lose if I log out
iPhone 12 Pro Max
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I changed my Apple id.
Check if this helps, see -> What to do after you change your Apple ID or password
What to do after you change your Apple ID or password - Apple Support