I’m having the exact same problem. I’ve got my game uploaded to Googles Servers, in Alpha, I’ve got what seem to be all the correct APIs. And all the accurate information about my app in the Android settings of Unreal 4. But the Login UI never shows up after being called. It just automatically gives me the On Failure result. The interesting thing, I’m using the exact method that I copied verbatim from the Unreal’s official Match 3 example:
This has been a constant thorn in my side, and I even followed Vipar’s tutorial to a T: (Integrate Google Play Services with Blueprint - Blueprint - Epic Developer Community Forums) hoping that it would be my saving grace. So please, if anybody knows what might be causing this issue, I’d be eternally grateful for any information leading to a solution. Please and thank you.