Xbox series x. Log in error when trying to play 360 games.

No she doesnt have her own xbox game pass ultimate but i am sharing it with her by setting the xbox she plays on as my home xbox. Yes she is part of the family group. Her account name is Canader. Everything works fine when booting up a one x game and she can even play on the series x games when im also logged in on the console. The problem is only when trying to play 360 games. When she attempts to play multi-player when on a 360 game it simply says she isnt allowed.

Hi Reuben! Let’s do our best here to figure this out.

To confirm, did you already try to sign in your account through the Xbox 360 console and Xbox 360 games on your Xbox Series X?
Don’t you have problems with Xbox One/Series X games?
What error message/error code you got there exactly?

Update:

What I have done is deleted my 360 file on my Xbox Series X and let it re download itself when I opend the game Left 4 Dead up because it wont work in game and will come up with the error, however the series X will download it on it's own when you boot up a 360 game.

The bad news is that my Xbox 360 still comes up with the error when Downloading my profile, so something to do with that way of downloading is the problem it seems.

Update:

What I have done is deleted my 360 file on my Xbox Series X and let it re download itself when I opend the game Left 4 Dead up because it wont work in game and will come up with the error, however the series X will download it on it's own when you boot up a 360 game.

The bad news is that my Xbox 360 still comes up with the error when Downloading my profile, so something to do with that way of downloading is the problem it seems.

I am having the same issue and same error code (80151912) when I'm running the Xbox 360 emulator on my Xbox series X.

I can sign into Xbox live on my Xbox series x but not on the emulator running the Xbox 360.