Urgent help needed. I sold my Xbox one and the new user can't get on

I sold my Xbox one today because I have an Xbox one x.

I factory reset it but before I did I had to sign in to Microsoft and make it my "home" Xbox. I thought the factory reset would take that away but the new person got it home and it says it's my home Xbox now.

I have already gotten on the one x and made sure it was my home Xbox, but he still can't get on.

He drove 3 hours to pick it up so I can't really go over and put in my password for him.

What can I do?!

Edit. He said there's no where to put in an email or create a new account. And no accounts are available.

submitted by /u/randomvegasposts
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