Hey there! Nice to meet you!
If I may ask, may I know when was the last time you successfully signed in to your Microsoft account?
Have you forgotten your account's password by any chance?
If not, may I have the exact error message upon signing in?
Aside from your recovery phone number, do you have other security information/verification methods, phone, or email address linked to the account?
Did you have two-factor authentication (2FA) active on the account? If yes, do you still have the 25-character recovery codes?
Best regards,
Darhyl