Buy the game and can't play it.

Hello @นัฐพงศ์แดงม

If you'd like to request a refund for your digital game, please access Request an Xbox refund | Xbox Support

If you don’t see the item you’re looking for, go to Why don’t I see my purchase in the list.

No. An underage account is allowed to PLAY said games if the parental settings allow it, but they can't buy it themselves.

Just like in a store, parents can buy M rated games and let their kids play them, but the kids can't buy it themselves.

The ratings on the games do not mean you can't play it. You just can't buy it in stores.

Also moving as I can't play FIFA due to sore losers. Can't get out of Avoid me and support refuse to help. telling me to buy another account or buy other games to play

if if if if if the next xbox can't play used games no one will buy it.