Having the same problem, I also made an alt account and received in a hour but now it says I already own the game in the main account
Here's the main profile: https://steamcommunity.com/id/gyrrecim/
So, all my friends received the invite except me, I waited for 4-5 days while theirs arrived in a matter of hours. Out of curiosity I asked one of them to send an invite to an alt account and the invite arrived in an hour, but when I went to invite the main account it already said that I owned...
