As of this date of January 15, 2019, whenever an invitation link is sent to the one being invited he/she is requested to "Download" the mobile application right? So, once it's done the invited is required to register and once it's done he/she then proceeds to go into claiming some prizes of the invitation via navigating in the app from Profile>Claim Rewards>Invite Friends; then scroll down to insert the code. But! once it is done the error "Account has been signed in" pops up and no rewards for both parties (the invitee and the invited).
I suspect that the program within the mobile application, which validates the account on whether if it is just created within the 24 hrs. or a few hours mark is that old, not yet made.
