Fallout 76 is an open-world RPG where players explore a post-apocalyptic world, complete missions, build bases, and survive against mutated creatures. The game can be played solo or online with other players in the wasteland of Appalachia.
The game will be permanently added to your Microsoft account.
The digital key is delivered automatically after payment.

Official game page:

Activation Instructions

Sign in to your Microsoft account.
Go to the redeem page: https://account.microsoft.com/billing/redeem⁠�
Enter the received key and click Redeem.

If you have any issues during activation or questions, please contact me.