Mac mail stopped working - keeps asking for password and I don't have one for the account
Mac mail stopped working and keeps asking for a password, which I do not have. I reset my Apple ID and it rejects that too. I have not removed the account and tried reloading yet because as a test, I tried adding it and got asked for my password, which I do not have because I never set one. This is a doom loop.
MacBook Air 13″, macOS 10.15