Accepting a friend request on an Xbox one S from an Xbox 360

Hey there Zexion Hellfire!

If you send a friend request to someone on a Xbox One from a Xbox 360, they will receive and be able too accept it, it wont come up as accepted to you, they need to go to a Xbox 360 and accept it, or they could go to
Xbox.com and accept it from there. Its the same with Xbox One, friend request dont get sent on Xbox One anymore so, if he sends you one from there he will be a follower, not a friend.

On the Xbox One, any friend requests will be followers if requested from a 360. They will show up as a follower until you add them back.

The 360 and Xbox One friend system seems to work in different ways. Try asking your friend to go onto his 360 (if he still has one) and accepting your request from there, or on the PC.

I had this issue as well when my friends switched from xbox 360 to xbox one, the one way i know to accept a friend request from xbox 360 to xbox one is to go on "xbox.com" and do it there or use the app.

Have you tried having him send you a friend request? This is some information I was able to find. It might be worth a shot to have him send you a friend request.

Viewing your Xbox One friends on your Xbox 360 friends list

With Xbox One, a friend is anyone whom you add to your friends list. Adding new friends on Xbox One does not require that they send a friend request first.

When you sign in to an Xbox One console, your Xbox 360 friends will automatically appear in your friends list, as well as your followers list. If you accept a new friend request sent from an Xbox 360 console, you will see them as a friend AND a follower
on Xbox One. However, friends who have been added on Xbox One will not automatically show up on your Xbox 360 list. If you plan to play with them on your Xbox 360, you’ll have to send a friend request through your Xbox 360 console. Once they accept, you’ll
then see them in your friends list on both of your consoles.

Xbox one has a following system so its completely different from the xbox 360. If possible sign into the xbox 360 on your account and it should let you accept the friend request.