Google User serverAuthCode nil in Objective-C

You need to make sure [GIDSignIn sharedInstance].serverClientID property is set; the value can be found in Google API Console.

Also, if you got user.serverAuthCode with nil value, make sure you called [[GIDSignIn sharedInstance] signOut]; before any subsequent attempts. Otherwise [GIDSignIn sharedInstance] seems to remember previous configuration.

I have no problem getting the serverAuthCode in the simulator.

Try NOT running it in the simulator :)

Had the same problem. GIDSignIn.sharedInstance().serverClientID is the same as GIDSignIn.sharedInstance().clientID. Solved by setting serverClientId too.