now I've updated my version from Android AG Auth 3.1.0 to 3.1.1 and it stopped working. If I revert back it works again, but at 3.1.1 it returns this stackTrace:
07-06 06:40:33.690 5751-5751/com.kumuluz.ccm.android.sample D/KeycloakHelper: Keycloak failure: AuthorizationException{error=invalid_request}
07-06 06:40:33.690 5751-5751/com.kumuluz.ccm.android.sample W/System.err: AuthorizationException{error=invalid_request}
07-06 06:40:33.690 5751-5751/com.kumuluz.ccm.android.sample W/System.err: at org.jboss.aerogear.android.authorization.oauth2.OAuth2AuthzService.runAccountAction(OAuth2AuthzService.java:278)
07-06 06:40:33.690 5751-5751/com.kumuluz.ccm.android.sample W/System.err: at org.jboss.aerogear.android.authorization.oauth2.OAuth2AuthzService.exchangeAuthorizationCodeForAccessToken(OAuth2AuthzService.java:208)
07-06 06:40:33.691 5751-5751/com.kumuluz.ccm.android.sample W/System.err: at org.jboss.aerogear.android.authorization.oauth2.OAuth2AuthzService.fetchAccessToken(OAuth2AuthzService.java:93)
07-06 06:40:33.691 5751-5751/com.kumuluz.ccm.android.sample W/System.err: at org.jboss.aerogear.android.authorization.oauth2.OAuth2FetchAccess$1.doInBackground(OAuth2FetchAccess.java:51)
07-06 06:40:33.691 5751-5751/com.kumuluz.ccm.android.sample W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:304)
07-06 06:40:33.691 5751-5751/com.kumuluz.ccm.android.sample W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
07-06 06:40:33.691 5751-5751/com.kumuluz.ccm.android.sample W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
07-06 06:40:33.691 5751-5751/com.kumuluz.ccm.android.sample W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
07-06 06:40:33.691 5751-5751/com.kumuluz.ccm.android.sample W/System.err: at java.lang.Thread.run(Thread.java:761)
07-06 06:40:33.691 5751-5751/com.kumuluz.ccm.android.sample D/LoginActivity: Login failed!