Guests can play if the owner makes this their home Xbox. (0x*2d40007)

That means it is already fixed.

now my brother has a error message when he tries to play a game saying “To play this, the owner needs to sign in Alternatively, guests can play if the owner makes this their home Xbox. Pls help

Are you trying to play the game on the account that purchased the game or a different account?

If you own the game, you can play it on an Xbox you have logged in to. If you set the Xbox as your "Home" Xbox (in the Settings) then guests can sign on and play the game on that Xbox as well. Be careful setting your "Home" Xbox though as you can only
change it so many times a year.

actually, one better than that is for the game to track what created the block: System, world owner, or guest. Then, allow the world owner (the player who's hosting/starting it) to set a flag where guests can't destroy owner blocks.

That means guests could dig all they want in the natural world, but they can't destroy the owner's forts, etc.

this would also setup for Adventure mode from the PC, where the owner could build up an a village or dungeon, and the guests can play it, but they can't destroy their way through it.

That doesn't work. The Child account cannot access ANY games that have been purchased under the Adult account unless the Xbox is set as the 'Home Xbox'. Once is is set as the 'Home Xbox', ANYONE can log on as a guest and play anything at anytime for as long as they want.

I want to limit the Child access. It sounds like I need to be able to make my Xbox a 'Home Xbox' AND delete the guest option.