This has occurred to me myself, for me plugging it in the charger and
holding the power button for 10 seconds fixed it, if not you could turn
it on and run a game to empty the battery. If its empty just charge it
and you’ll be A-ok
How nice of you to do this for your grandson, your best option would be
to download it on a phone or computer and log into the account so you
can buy it on that device, the oculus systems tend to be glitchy with
payments