Hey there! Nice to meet you!
Since you mentioned that your account is blocked, may I have the exact error messages when signing in?
Do you have access to the security information/verification methods, email, or phone number linked to the account?
Did you have two-factor authentication (2FA) active on the account? If yes, are you able to access the second factor of authentication?
Also, do you still have the 25-character recovery codes for 2FA?
Lastly, may I know when was the last time you successfully signed in to your Microsoft account?
Best regards,
Darhyl