I am using UE4 with Playfab and I ended up modifying the engine to return the ServerAuthCode with an updated google play login call. I am using Signed By Google Play in my project so most of my testing has been done with apk's signed with my upload key (which is in my console) in both Debug and Shipping builds. The issue now is that I am able to log in to google play but it doesn't return the authToken during the request in the APK's signed by Google but they work just fine when signed by the upload key.
The sign in request is:
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_GAMES_SIGN_IN)
.requestProfile()
.requestServerAuthCode("PlayFab OAuth Client ID")
.build();
I know it is signing in to google because my IAP query is showing up (which relies on the UE4 Online Subsystem getting stuff from Google) but my auth token value is returning None. The engine is using Google Play Services 11.8.0 and I have not yet tried to update the version yet but that is on the list.
I have tried both the silent login and not, triple checked all the API key settings, checked the logs as much as possible but in shipping builds it is next to none, and I have tried logging in with a CustomID (which does work and receipt verification does work when playfab is working).
I feel like I am missing something but the way the I understand the flow is Sign In with GPG->Get Auth Token from PlayFab server->Send the Auth Token back to Playfab with the LoginWithGoogle request.
