Hey there! Nice to meet you!
If I may ask, have you forgotten your account's password by any chance?
If not, 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?
Since you mentioned this: "If I am able to get validated against my alternate phone number or email address"
Just to confirm, do you mean you receive an error message when resetting your password using your verification methods? If yes, may I have the exact error message please?
Do you see any unfamiliar email addresses/phone numbers upon signing in to your 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