No email received for friend invite on PC

Didn’t receive an invite for last weekends flight but i did receive for this one. I didnt receive an email but had a notification that I was invited this weekend. I noticed that the email you received is the email that contained the friend invite code… Just wondering why I didnt get one and if maybe somehow i can get one for a friend that is trying to play. He signed up but didnt get a code for some reason…