I got code for game Sea of Thieves

It'll actually just show up in your downloads under the Sea of Thieves game. No codes. Got to My Games and Apps, then Sea of Thieves, hit manage game and it should be ready to install.

Also the problem with the game not installing is only for sea of thieves but for other games they get installed but when I launch them it pops up with the error code 0x803f8001 while for sea of thieves it pops up when I try to install the game.

Hey MarinZD

Thank you so much for taking the time to post this on the Xbox Forums.

In regards to this matter,
Xbox Customer Support is currently able to replace that code for you, as long as you meet certain criteria.

Alternatively, you can try to perform an
account region migration, but that would place you in a state where you will be unable to switch regions for at least 90 days from the initial switch.

I would also add that as per the
Xbox One Locale FAQ it states that "There is no playback restriction on games purchased and downloaded." this would mean that
, if you purchase and download a game in one country and then move to another country where the game isn’t available, you can still play the game that you downloaded. However, you would not be able to redownload the game you purchased, as it would not
be available for you to download in the Store.

I would instead recommend that you try and use the Xbox Digital Code Solution instead, and see if using this
self-service option will work for you.

The region of a code cannot be changed. If you bought the code from a retailer, you would need to contact them to see about exchanging the code for one that will work for you. However, as Croatia is not a supported region, that may not be possible.

when i got the all digital i had three codes for sea of thieves, minecraft and 3 months of gamepass, the two games i got to keep as they were redeemable codes.

if you did not get the codes for the games they would have been tied to gamepass and when that runs out you lose access.