Cant Verify Its Me?

[Windows 11]

I'm trying to turn on "Backup and sync your settings", but it says i need to verify my email. When I try and type in my Microsoft account, It says that account doesn't exist, but when I try and make a new account with that email, it says the email is taken. Why is this? I tried to sign in with a different Microsoft account, but when I did that, it said "An illegal state change was requested". I'm getting a new computer and I'd like to have the settings and data the same on both, but can't if this is happening. I'm running on windows 11.

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