I cant purchase games online

Hi, and thanks for reaching out. My name is Miguel O., Sorry to hear you're experiencing this issue!

Please proceed to do a power cycle to fix the issue

1. Turn off your console by holding the Xbox button  on the front of the console for approximately 10 seconds. The console will turn off.

2. Turn your console back on by pressing the Xbox button  on the console or the Xbox button  on your controller.

If you don't see the green boot-up animation when the console restarts, repeat these steps. Make sure that you hold the power button until the console completely shuts down.

Important If your console is in Sleep mode, the above steps will shut the console off completely. Sleep mode, or the ability to turn on your console by saying "Xbox on," won't be enabled until you restart the console.

Also please try to reset your modem.

If your problem persists or the problem is fixed please let me know!

Another way around this is by buying the games and entering the store via your pc

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Another thing you can do that i learned over the years that if you want to purchase a game in a different currency that you obtain but cant buy within your xbox is change your location online and purchase the game on online on that currency location then
you can buy any game you want with the money you have

You cant transfer gamerscore between profiles OP, and if you want to purchase DLC off the LIVE marketplace you need to purchase Microsoft points.

You can purchase them online from trusted sites or from all game retailers.

your account location, console location, and physical location all have to match or you will not be able to download it. NOTE: having an account set up to a location that is NOT your real one is against the Terms of Service and you could possibly be banned
for it.

Account license - required to be connected to xbox live, is rather like a public license that is checked when loading a purchased game online. If you are not connected, they cant check.

Console.licenses. The rather local license, it wont require xbox live, or being Connected to it to launch the purchased game, though a connection may apply if you cant get passed the game update screen.