Hey quick question for refer a friend program.

I sent two friends invites to play the game. They did not receive the invite so instead I sent them the copy past link. They did sign up through the link and purchased the game.

my question is I didn't receive any email about them signing up through the program. I checked my settings and it is setup for me to receive any emails. I was wondering if this is an error, or will I still receive the rewards after we play the game and do the requirements to unlock them?