Managing personal Outlook.com account settings, security, and privacy
I’m sorry you are dealing with this. Knowing the password is not enough when Microsoft requires verification, and support agents cannot manually bypass the account’s security settings or restore access.
Here are some suggestions you can try:
Use the Microsoft Sign-in Helper first and enter the old account address. This can identify whether the account still exists and which recovery path applies.
If directed to it, submit the account recovery form from a device and location previously used with the account. Include the current password, older passwords, approximate account creation date, device details, Microsoft services used, folder names, purchases, and any exact email subjects you remember. You may retry up to twice per day, and the result is usually sent within 24 hours.
Check old phones, computers, browsers, and password managers in case the account is still signed in somewhere. If two-step verification was enabled and no verification method or recovery code remains available, the recovery form and support cannot override it.
Also, personal accounts inactive for more than two years may have been deleted, in which case the OneDrive files cannot be recovered.