Xbox One not working when Switching Accounts?

The kind of sharing you are referring to, requires your brothers HOME xbox to be the one you are playing from and vice versa.

SO if you have 2 Xboxes and 2 Accounts:

Your brothers home console needs to be your xbox, where you then log in with your account to play on.

Your home console needs to be on your brothers xbox, where he is then logged in with his profile, still able to play your games.

This way is how i have been using it for the past 3 years without any issues. The important step is to make sure you set each others Home Console on the other persons Xbox, to ensure he has access to the content, even tho he is not logged in.

Hope this clears things up.

My buddy and I 'gameshare' on Xbox.

It's super simple: My Xbox at my house is his 'home console', but I use my account on it. His Xbox at his house is set to my 'home console' and he uses his account on it.

My Xbox has access to his games because it's his home console, but I also have access to games purchased with my account anywhere I am. He has access to my games because it's my home console, but his account can access any games purchased by his account as well. I buy Monster Hunter - he can play it from his console. He buys DBFz - I can play it from my console. The account that purchased the game can access it from any console, anywhere, anytime - as long as you are the only person signed into that account at the time (obviously).

Both of our account are Xbox Live Gold, and I don't know if that is a requirement - but I'd assume it is if both of your accounts are not Gold. "Play anwhere" might be a feature for online subscriptions.