I understand people are finding some of the new requirements a pain, I would like to say that I also find them pretty tedious. Just so everyone is clear:
- APK files must be signed
- You must supply your SHA-1 certificate signature in the Google Play Developer Console
- The Google account you are testing with must be listed as a tester in the Google Play Developer Console
If any of these are not done, when login is called it will briefly show the Play Games dialog, then it will vanish. These 3 things are required by Google (not by us), and any application that wants to use the Play Games service on Android must fulfil them.
The reason why they were not previously required was because we used the Web API on all platforms, and the requirements are a lot slacker for the Web API. Unfortunately Google no longer allow you to use the web API within a WebView for security reasons.
There are currently no known issues with the plugin. If you are experiencing a bug that isn't a sign in related configuration error then please open an issue on our bug tracker and I will look into it ASAP.
Would it be possible to post a step by step guide (with images preferably) showing how to do all these (including Sign In/Out, Leaderboard etc.) Thank you!