Can I use my xbox ultimate pass subscription to play on my xbox one and mac at the sametime?

The issue is he isn't using cloud correctly not.gamepass ultimate

The second account should not show any subscription linked to it, but it should be able to play Game Pass games without no problem since the first account has Game Pass Ultimate.

Are you sure that on Xbox your son is logged in with his account and on the Mac you're using your account? These kick in errors happens when trying to play simultaneously with the same account. If you're 100% sure that the accounts are logged in properly, let me know and we'll proceed to further troubleshooting.

I have setup a family account. My main account with the subscription is the organizer. So, I have my main account with subscription and email. I have another account linked to the family with a separate email. I can see that my xbox is the connected device for both. My second account does not show any subscriptions. When I go to the xbox/play on my mac with my second account it does not allow me to play on the cloud. All it does is ask me to join. If I switch accounts and am on the main account at the same time as my son is, only one of us can play, kicks the other out. I have checked both accounts and the my xbox is selected. Does it have anything to do with me trying to play on a Mac?

Thanks for the continual help and hopefully can problem solve solution.

Just a note.it's best not to use 2 devices via cloud

Xcloud does.take.a performance hit and doubley.so

Local.is always better

Ok, I will keep trying. Thanks for the suggestion.