Friend doesnt get invitation

[Temmieflakes211]

I and another person both invited a friend to the game and he hasnt gotten a invite yet.The first person sent him an invite well over a month ago and I sent it to him a few hours ago. If any of the moderators or devs see this I would love if you could invite this person: https://steamcommunity.com/id/biganimehentaitiddies

EDIT: Thank you to Moderator Sapphire for their help!