Buying crypto for a friend of mine?

Hey, I have a kinda stupid question. So, a friend of mine cannot create his own account (his passport has expired and we live far away from home, so it's pretty hard to get a new one at the moment due to corona) and he wants to buy cryptos on my account and instantly transfer them to his personal wallet. Do you know if there are any tax traps I have to look out for (austria) or if there are any known problems in general, or is it no problem at all? Thanks for your time.