Solved! Go to Solution.
HexHyteOk found it.. will try
I had the same issue. I figured out that the cause of the problem was the "Background connection Whitelist" option in the Armoury Crate.
Basically Google Play was disabled in the Whitelist and of course it couldn't connect to internet to download the various in-app purchase.
The solution is to enable Google Play Store and Google Play Games (recommended) inside the Background connection Whitelist or to disable the Background connection Whitelist function completely.