The application is incorrectly configured Google Play Game Services

Question

Mabe will I look like a true newbie, and mabe am I, but I'd request some help from you !

I have done all this :

added and linked my app in the Dev Console (game services) included the App_id into my app/manifest added BaseGameActivity and GameHelper to my project (from GitHub) added the google-play-services library to my project extended BaseGameActivity I took App_id from console, it's 100% correct. I'm trying to log in with an test account SHA1 and package name 100% correct.

I have put the app id & achievement ids both in the ids.xml file & strings file

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <string name="app_id">239----------</string> .......

And I still can't get rid of this "Application not correctly configured"..... neither on the test one neither on the signed one. I have created two client IDs in Google Developer Console>Credentials with both the test & signed sha1, correct information & deep linking successively disabled & enabled.

I'm starting to be bored.....

Answer 1

Linking a new app to my dev console with exactly the same parameters solved my problem :)

Answer 2

After 4 hours of researching, i found the solution to fix this error successfully:
When developing, make sure you sign the SHA1 with you debug.keystore NOT release keystore.
Good luck!