Managing personal Outlook.com account settings, security, and privacy
I’m so sorry this happened to you, G Franck.
The particularly frustrating part is that the attacker appears to have enabled two-step verification after taking over the account, which effectively blocks the recovery form you would normally use. And unfortunately, the message you received is consistent with how Microsoft’s recovery system works. It's also stated under the first field of ASCR form:
The only official route for compromised account is Microsoft's Sign-in Helper. It can identify your account issues and provide the appropriate self-help options. In addition, if you previously used the ACSR Form, there's a chance you can try Microsoft Account Recovery Form instead (particularly helpful if you use Xbox service).
Remember to not sign out or remove the account from the phone where the mailbox is still accessible. That existing session may be useful for preserving access to important messages while you work through the recovery options. Other than that, I have to be realistic here so you can have correct expectations going forwards:
- Microsoft Q&A is just a public user-to-user support forum. Contributors, including moderators and external staff, cannot access your account data to verify or restore it.
- The recovery system is automatic and can only proceed to the next stage after account ownership is confirmed. No one can manually review your proof or change account information.
- Even if you contact Microsoft Support, they cannot skip this process. Microsoft prohibits its customer service representatives from sending links to reset passwords or bypass verification.
So in this case, repeatedly submitting the ACSR recovery form will not solve the problem while two-step verification is active. The Sign-in Helper is the only possible next step.