Sea of Thieves Xbox Series

Xbox installing by a game code.
1) On the Xbox Console

Press the Xbox button to open the guide, and then select Home. Make sure you’re signed in to the Microsoft account for which you want to redeem the code.
On the Home screen, scroll right and select Store.
Select Use a code.
Use the on-screen keyboard to enter your 25-character code on the Redeem your code screen, and then select Next to finalize your redemption. Don’t worry about hyphens, the system takes care of those for you.
In the Browser

In a browser, go to Redeem code, and then select Sign In.
Enter the 25-character prepaid code, and then select Redeem.
Once the code has been redeemed by any of the two methods above you will see the 'Sea of Thieves' in the 'Ready to Install' section within 'My Games and Apps' on the Xbox Console ready for install. Select it to begin the install process.