Tuto: Download the Call of Duty Black Ops 3 Beta on Xbox One without redeem code

So, it’s really simple :

1. Go to the Xbox Store, log in and click on “Japan”: https://account.xbox.com/Shell/ChangeLocale
2. Then download the beta from this page: https://store.xbox.com/ja-JP/Xbox-One/Games/Call-of-Duty-Black-Ops-III-Multiplayer-Beta/3aff42d2-453c-437a-a489-c49a7b068e84

Source: Reddit