There are quite a few rules that must be followed for the challenges. Are you sure that you didn't miss something by accident?
Vicki Kieu
I did received all the rewards from the last round pay out. They don't owe us any payout as of now. You must make sure to read the registration page and follow the rules properly otherwise you don't get paid.
Sfserra
I'm also receiving it well without any issues like this..
Christine Caraang
I got my rewards. Yes, look at the instructions if you missed anything