Based on my experience this is 100% on C1s side, but they'll neither admit it or do anything to actually help you. If you go to the Transfer Rewards page on the C1site, you might see a "Pending Transfers" message on top of the page, and it should show your miles. At least that way you know they're not lost, and still sitting with C1. But it's anybody's guess when they'll come through for you. Once C1 dropped their extra priority pass benefits their card became pretty irrelevant.