Xbox 360 profile on Xbox Series S?

I’m on an Xbox series S not an Xbox one, and I have a microsoft account just not an account that works for xbox 360 games and it says I need a gamer profile

All Microsoft Xbox accounts have an Xbox 360 profile that can be downloaded to either a real Xbox 360 console or to the Xbox 360 emulated dashboard on Xbox One and Series X|S consoles. Even if you made a new account now, it would still have a 360 profile.

When you run a backwards compatible 360 game on your Series X for the first time, you will be asked to enter your email address and password. This is so the 360 profile can be downloaded. It does this because that is how the Xbox 360 does things.

Hi, I hope you're doing great out there. I am an Independent advisor and I am here to help you with your concern.

If I may ask, are you playing the game on an Xbox 360 console or Xbox One/Xbox Series X|S?

This will determine the steps we have to perform such as deleting and re-adding the 360 profile if you’re on Xbox One/Xbox Series X|S.

Xbox One, Xbox One S, and Xbox One X controllers work on Xbox Series X|S, and vice versa. However, Xbox 360 is on it's own, similar to the OG Xbox.

What's cool however is if you remote stream Xbox One, One S, One X, Series S, or Series X on, say, a PC, you can plug in a 360 controller and use it on the newer generation.

But no, newer controllers aren't supported on 360.

Xbox 360 games do not appear to see these users and I'm unable to select them when adding players to 360-games.

User accounts work differently on the 360 (and the 360 emulator on the Xbox One and Series X/S) to the way they do on Xbox One and Series X/S. The 360 had user profiles that needed to be downloaded first.

It's been a while so you'll need to bear with me. If remember you will need to sign in first with this other user you've created, then launch the 360 game. This will download the additional new profile to the console. I think, after this you should be able
to add this player to your game.