With the account that has the game purchased, log on to the new Xbox, go to settings, personalization I think, and there should be an option to set as home Xbox. After you’ve done that, download all the stuff from the same account and when they are start downloading, you can sign out and use whatever account.

[spoiler]My account has -Xbox live gold -And any games I own My father's Account has ownership of -Destiny: The base game -dlc 1: The Dark Below -dlc 2: House of Wolves -dlc 3: The Taken King -dlc 4: Rise of Iron -And any games he owns A consoles game-sharing feature works by SHARING any licenses a PRIMARY account has with any other SECONDARY accounts on the PRIMARY accounts HOME Xbox. In order for game-sharing to work properly between two people you must set the home Xbox as the opposite persons. In my case, the Xbox I personally play is my father's Account HOME Xbox. And the Xbox he personally plays is my accounts HOME xbox. In turn my account now has access to -Destiny: The base game (digital) -dlc 1: The Dark Below -dlc 2: House of Wolves -dlc 3: The Taken King -dlc 4: Rise of Iron -And any games he owns And in turn my father's Account has access to -Xbox live gold -And any games I own If either of us were to change the location of our HOME Console then other person would lose Access to the others licenses. Note for someone to have access to dlc 4: Rise of Iron that Account must OWN dlc 3: The Taken King. So even I wanted to buy Rise of Iron alone my account can't because it doesn't have own the TTK dlc. So in the event that I personally need to download the game and it's dlc on third Console I would have to sign in my father's Account in order to Download the game and it's dlc. This guide or format or whatever you want to call it, applies for any game,dlc, subscription licenses you own. For destiny 2, in order to use the dlc you must download the dlc using the account that OWNS the dlc OR the season pass. Secondary Accounts can't do this even if the dlc is already installed on the console.[/spoiler]

you can game share, you just have to make sure it is set up properly.