Legends of Runeterra: can't buy

Hey!

I'm playing Legends of Runeterra (yes we exist) on Linux (Debian if that matters). It works well but I can't make purchase in the game (when I try, it loads forever and I have to restart the game).

I downloaded it with Lutris following leagueoflinux instructions, except the "no disconnect" version does not work so I downloaded the live version.

Can anyone help?

Thanks a lot!