Can't play games from xbox app on pc with friends on xbox

You can download Destiny 2, and it's DLC from the Xbox app on PC. So your friend who plays on Xbox and PC can play Destiny 2 and the DLC you gifted him on the PC, as long as the PC he has is powerful enough for the game.

i want to play some games at my xbox with my friend,but he is far away from me,can i stream the xbox to my pc and his pc at the same time? or at least only his pc?

Well, not with the Xbox App on your PC. However, if the game (and the speed of your and your friend's internet connection) supports it, you can stream your gameplay to
Mixer.

Mixer has interactive features, where you can share a controller to the Mixer streaming website, and the viewers (including your friend) can then "grab" the shared controller and play the game with you.

Be aware however, that if you stream the game to the PC via the Xbox App, you can't stream to Mixer.

You will have to locally play on your Xbox console, and stream to Mixer for your friend to be able to play with you.

Also be aware, that while Mixer provides low latency streaming, there is still some lag happening, so your friend would be at a disadvantage, playing through the stream. So don't try to play timing sensitive games.

Hi, my friend has the pc version from the xbox app, and as said before he is unable to join due to not receiving a notification of the invite, he is on pc but is using the xbox app to play with me

Both Xbox and PC games will show up for your friends if they are using Windows 10 and and are logged into the Windows 10 Xbox App. Your friends are playing Arma3 on a PC, not on a console.

You don't need an Xbox, there's an Xbox app for PC that is used to access the Xbox services on games

Don't know what you mean when you mention unverified app, as all Xbox apps are from Microsoft

You can't play Minecraft without a Microsoft account currently