Sold iMac in 2015 and current owners info is showing up all over my Apple ID.

I must not of wiped everything completely back then and I just got a new iPad and our info seems to be mixing together (See Picture)

My name is not Keith L.

That is my profile pic

Thats not my address or Phone number that should be tied to my apple ID

That is my Birthday etc.

I've contacted this guy through email and he says my stuff is showing up when he does zoom meetings etc.

How can this all be fixed? What does he need to do on his end so he doesn't see my info and vice versa.

Any help would be great.

Thanks,

[Personal Information Edited by Moderator]