DP: I am not sure what happened exactly. P1 and P2 did the same thing but with differing results. Both enrolled 2 cards, got 6 months of +, and 2x$20 credits were showing. P1 had no problem doing 2 orders with each getting the $20 off, but P2 used one and then there was no longer a second one available to use. The only difference was that P1 did both orders on a PC and P2 did 1st order and PC and then the tried 2nd via app.