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Despite what Apple recommended I think what you need is:
What to do after [or before] you change your Apple ID email address or password - https://support.apple.com/HT204071 - "After you change your Apple ID email address or password, you might need to update your sign-in information with any Apple services you're using." - Or if you're seeing persistent disabled messages or repeated requests for the password to your previous Apple ID.
Question: If I try to download anything my account keeps getting disabled for security reasons, what to do?