I have been a longstanding 1password customer of both the Mac and iOS versions. I have purchased the pro features in-app years ago. Recently we got new phones (6s) and I cannot restore the features anymore on those new phones.
I purchased the app and the pro features on an old iTunes account via an in-app purchase. I now use a different one for myself but the old one is active and administers the entire family account and holds payment credentials for the family.
I have signed in to iTunes on my device with the old account. I have rebooted my phone and the App Store, settings, and 1PW apps. However, 1PW persists in either asking for my new iTunes credentials or just not asking at all and stating it cannot find a purchase.
I have verified the purchase and account used.