Hello, I’m Virginia a fellow Windows user.
I suspect that as the account has been blocked by Microsoft due to not being able to confirm you were the genuine owner.
You can try these but I suspect the request will be denied or ignored.
Can’t sign in:
You can try also https://support.microsoft.com/home/contact & choose Account Recovery.
If none of the above work then you’ll require the account recovery form:
Please note if you have 2/multi factor authentication active on your account then you cannot use the form to recover the account.
If you’re successful in changing the details then you may find that the account is limited for 30 days, this is a security feature & cannot be circumvented.