AssociateUser.cs

public class AccessUsers_Extension : PXGraphExtension<AccessUsers>
{
  ...
  protected virtual IEnumerable associateUser(PXAdapter adapter)
  {			
    Users user = (Users)Base.UserList.Current;			// Acumatica user

    if(GoogleActive && user != null)
    {				
      ...
      if (!string.IsNullOrEmpty(user.Email))
      {
        GoogleMaint socketGraph = PXGraph.CreateInstance<GoogleMaint>(); // My screen graph

        GSocket gc = socketGraph.CreateGSocketInstance();
        if (gc != null)
        {
          try
          { 
            UserData userItem = gc.GetUser(user.Email);
            if (!string.IsNullOrEmpty(userItem?.ID))
            {
              user.IsApproved = userItem.Active;      //Enable/Disable the user

              user.AllowPasswordRecovery = false;     // SSO does not require password recovery
              user.PasswordChangeable = false;        // SSO does not require allowing to change the password
              user.PasswordNeverExpires = true;       // Any password never expires
              user.PasswordChangeOnNextLogin = false; // No need to change the password next login

              Base.UserList.Update(user);

              SetUserIdentity(userItem.ID);           // Sets the Account ID
            }						
          }
          catch(Exception ex)
          {						
              // Error here
          }
        }
      }
      Base.Actions.PressSave();
    }
    return adapter.Get();
  }
  ...
}

UserIdentity.cs

...
foreach (var uiRow in Base.Identities.Select())
{
  UserIdentity ui = (UserIdentity)uiRow;
  if (ui.ProviderName == Provider.Google)
  {						
    ui.UserKey = userKey;   // Account ID
    ui.Active = active;
    
    Base.Identities.Update(ui);													
    break;
  }
}
...