my friend is trying to download the app but it doesn't show up

Nope doesn't show up in games and apps as available to download.

Very similar here, I try going to the store, unable to buy it unless it is apart of a bundle (I have all of the rest already.) I see the pre-order bundle was still in the smart glass app. Purchased it there and doesn't show up in my downloads on my xbox.
However, it does show up in my purchase history.

You download it, but when you search for the app on the xbox app, what happens? it doesn't show up there?

Yes.

The outlast bundle pack shows up in the games that I have bought and downloaded for my Xbox and it as well shows up in my billing history. (They even sent me an email confirming my purchase)

Although for some reason it just doesn't show up on my Xbox games & apps page.

Thank you for replying!

The error code is 0x00000001, I looked it up but can't find a way to fix or fixes don't work.

I have been trying to download the game through Xbox app, and when I find it through Microsoft store, it only has the option to download it through Xbox app.

Sorry I was talking about the "Gaming Services" app that I think I need to play games through Xbox app, it is supposed to be downloadable through Microsoft store but when I look it up it doesn't show up. It isn't downloaded, so I tried to open it through links online and windows PowerShell, which both worked, they took me to a page on Microsoft store, but there is no button or way to download it. However I have found the app on Microsoft store now and it shows up as downloaded, it doesn't seem to have shown up on my pc though, it did before I tried resetting it.