Hey there! Nice to meet you!
If the account does not have access to the verification methods for a password reset, I'm afraid the only way to recover the account is through the account recovery web form: https://account.live.com/acsr
Important: If your husband has an active 2FA, ACSR will inform him that his recovery request will be ignored. If he only receives a message that the recovery request is either successful or indicates insufficient information, this means that 2FA is disabled.
You'll need to keep trying until you're verified by Microsoft, and you can do this up to 2 times every 24 hours.
If the Microsoft account recovery request was not granted, please review this link for tips on improving your chances of a successful recovery: https://support.microsoft.com/office/dc56c3e3-dff0-4ed5-8edb-60290eea6b53
Please be advised that Microsoft Support will not be able to grant access to any accounts.
Thank you for your understanding.
Best regards,
Darhyl