Adding Google Play to Unity Project -> java.lang.ClassNotFoundException: com.google.android.gms.games.PlayGames

Question

I have a Unity 2020.3.32f1 game and need to fix Google Play login. I upgraded to 0.11.1

Now I get an exception

AndroidJavaException: java.lang.ClassNotFoundException: com.google.android.gms.games.PlayGames

when I try to init the library

   public GooglePlayService()
   {
       InitStatus = InitStatus.NotInitialized;
       LoginStatus = LoginStatus.NotLoggedIn;
       PlayGamesPlatform.DebugLogEnabled = true;
       PlayGamesPlatform.Activate();
       Log("PlayGamesPlatform.Activated");
   }

Following their instructions on adding Proguard and minify did not help.

I am a bit of an Android noob so it's probably something basic.

Notes:

• I ran the Android dependency resolver.
• Minify is turned on for release
• Min API Level 19
• Target API level 30
• I am using the internal build system
• No strange characters in my project path