For months now no beta's are distributed for my App. Everything seems O.K., the Playstore mentions the user is a beta user, it just keeps serving the production APK.
There is this thread on SO : http://stackoverflow.com/questions/16752887/play-store-beta-testing-doesnt-work
Somebody mentions it working very unreliably for them as well ( 2015 ).
Does it actually stil work?
Ask HN: Does anybody have the Android Play Store beta testing running smoothly? | Heykuki News