Android Blueprint calls no longer work

Hey guys,

I’m using unreal engine version 4.15 and have a problem with my android project.
When i call any of those functions in the blueprint it seems that it doesn’t call a success or fail event in my blueprint logic chain:

  • Show External Login UI
  • Write Achievement Progress

Both of those functions worked just fine a week ago. I also updated my Androidworks build tools but that didn’t fix the problem. Maybe the UE4 engine needs an update?
It would already help if someone with an android project running could check if this is a bug or just a local problem from my side.
The App is currently uploaded to the google play store as alpha version.

Thx a lot!