Install Xbox games bought on Microsoft account?

I bought Forza Horizon 4 as a code and entered it at Microsoft Store. Code was valid. How do I install the Play Anywhere game on Xbox One S now? Do I have to go to the Microsoft Store or does the game appear in the library after a few hours?

Actually it should be possible to install it almost immediately.

You can click on your pc / laptop on insterliren then he shows you the available platform. Then you click on xbox and it should then start the download.

Problem solved:

It was activated on another account.
Why didn't I recognize that?
- same profile picture
- almost the same email
- and I forgot that there were 2.