Setting up new Xbox on gamepass, already have an account

Merry Christmas everyone. My young son has just got a new Xbox for Christmas. It's the series S.

We have a gamepass account linked to his older brothers series S

my youngest son, had an Xbox one console prior to this. He had access to the gamepass account on this console and had his own account set up there.

I have now signed on his account and he has no access to gamepass.


Does anyone known the solution for this because it was set up fine previously on his Xbox one.


My oldest son is complaining that he can't use his account for the new Xbox because it will sign him in whenever my youngest son turns on the Xbox.