If the old email is no longer accessible, the remaining self-service path is account recovery.
- Start with the Sign-in Helper. It checks the account details entered and tells what action is needed.
- If the account asks for verification methods that are no longer available, choose I don't have any of these and continue with the account recovery form.
- Use a working email account for contact during recovery. That address is only used to send updates about the recovery request.
- Complete the recovery form from a device and location previously used with that Microsoft account if possible, because that improves the chance of successful verification.
- Gather any old passwords that may be stored in Microsoft Edge or Windows Credential Manager before submitting the form.
Important limits:
- If two-step verification was turned on and there is no access to any alternate verification method, support agents cannot send password reset links or change account details.
- If the account has not been signed in to for more than two years, it may have been deleted and cannot be reopened.
- If the sign-in says the account does not exist, carefully check the spelling, then use the Sign-in Helper.
Based on the described situation, changing the email address on the account does not bypass the original identity verification requirement. Recovery of the Microsoft account is the required step before access-dependent actions can continue.
If recovery fails repeatedly, the available next step is Contact Support / Get Help, but support still cannot override the security restrictions above.