Hi, I'm John! I will help you with this.
To help narrow down the issue:
- Can you share what made you think the accounts were hacked?
- Does it look like the email address linked to your account was changed?
Also, please try searching for the account using these steps from Microsoft: https://support.microsoft.com/account-billing/forgotten-your-microsoft-account-username-b2049472-3b8f-27d3-61c6-67a668453f4c Click on "Search" and follow the instructions provided.
If you receive any error messages, such as “account doesn’t exist” or anything else, please let me know.
Click "Add comment" to let me know.
Regards,
John J.D.