New friends on Xbox 360

this may help

https://beta.support.xbox.com/help/friends-social-activity/friends-groups/view-xbox-one-friends-on-xbox-360

On Xbox One, a friend is anyone you’ve added to your friends list. Adding new friends on Xbox One doesn’t 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 in your followers list. If you accept a new friend
request sent from an Xbox 360 console, you’ll see them as both a friend and a follower on Xbox One.

However, friends who’ve been added on Xbox One won’t 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 see them in your friends list on both of your consoles.

If you go into the 360 game menu on the xbox one you may be able to see this.

https://www.youtube.com/watch?v=q7YhbokEf2U&feature=emb_logo

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.

Same issue for me as well. Moved from xbox 360 to xbox one a month ago and I cannot see any xbox one friends on my new console, only initial xbox 360 friends list.

I had the same issue. It's because your new Xbox One friends aren't on your 360 friends' list. You need to send them a friend invite from your 360 or you can do it online from your computer:

- Log in,

- go to "friends",

- select the friend in question,

- and then under that person's "Friends" drop down menu, select "send request - Xbox 360".

Good luck!

And hello to new Friends. Besides, all of my Friends that I actually play with currently on the Xbox 360 are already getting an Xbox One. So what's the problem?