Cant Purchase certain things from thr Microsoft Store

Hello, first it's a pleasure to be able to help you today.

My name is welcome to the community.

Hello Craig, heve you tried to switch devices or even experiment with another browser to make the purchase, at this time Live services are all operational and show no problem with purchases.

https://support.xbox.com/en-us/xbox-live-status

The Microsoft Store offer is only for purchases through the Microsoft Store, which is different from purchasing through the Windows 10 Store. Usually Microsoft Store purchases are only physical copies of the game, which may have been eligible for a $10 discount
on future purchases from the Microsoft Store, but this is separate from the digital-only Windows 10 Store.

Hope this helps clarify things.

Was the DVD set purchased new? I'm afraid it's impossible to move products between accounts, once the code is used it's used.

The DVDs are now completely outdated and he would have to download the game again anyway.

You can sign him up for PC gamepass, which includes Flight Simulator, or you can return thr DVDs and purchase thr game from the windows Store or Steam

If you're under 18, you can't download M rated demos no matter what your settings are.

Ive purchased the disc version which comes with episode 1 and thr season pass so i should be able to download episodes 2-5 through the store but i can only download episode 2. 3-5 says i still need to purchase it even though i have thr season pass installed