Hey there! Nice to meet you!
You mentioned: "When we attempt to enter a mobile phone number a messages say that this method is not available and to try a different method. But there are no other options."
That is an indication that the account is temporarily blocked due to the system detecting unusual activity.
Your partner will need to perform these steps to fix the verification method error:
- Perform a password reset via Incognito/InPrivate window using different devices and network services.
- If it doesn't work, wait exactly 48 hours to perform another password reset.
Important: Please make sure not to attempt to sign in or reset the password within that timeframe (48 hours), as this may reset the lock cooldown.
Lastly, account blocking is a fully automated security measure. Microsoft Support will not be able to assist with manual recovery, unblock, or escalation, as stated in this article, that they are not permitted to send password resets, access, or even change any details on the account:
Thank you for your understanding! Please feel free to let me know if you need anything else.
Best regards,
Darhyl