password changed

If you signed into the community using that ID, the password hasn't been changed. See the Apple Support article(s) below.

 Apple ID Password Change.      

 What to do after you change your Apple ID or password - Apple Support     I suggest doing this before you change your Apple ID or password.

If you can't change the password, link to contact Apple Support in the article.

Apple ID has been compromised.      

See Change your Apple ID password https://support.apple.com/en-us/HT201355

And see What to do after you change your Apple ID or password https://support.apple.com/en-us/HT204071

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Also see these security-related documents, especially the first two.

If you think your Apple ID has been compromised https://support.apple.com/en-us/HT204145

Security and your Apple ID https://support.apple.com/en-us/HT201303

iCloud security overview  https://support.apple.com/en-us/HT202303

Ways to keep your information safe on Mac https://support.apple.com/en-gb/guide/mac-help/mh11402/mac

Using app-specific passwords https://support.apple.com/en-us/HT204397

UseTwo-factor authentication for Apple ID https://support.apple.com/en-us/HT204915