CREATE AN OAUTH CLIENT ID After Firebase Launched

In the past few month, we use OAUTH CLIENT ID to implement Google Sign-in, We usually go a google page to create the OAUTH CLIENT ID, but suddenly, when I try to create a new one last week, the url redirect to firebase. Then I search on the Google Developer document and find a new place to create the OAUTH CLIENT ID(Here is the link https://developers.google.com/identity/sign-in/ios/start-integrating), but after I input the information usually we provided, it show errors like: enter image description here And after testing with other account, I found it can only be sccessful when you add your first app into one project. if you want to add another one, then it will show errors. Can anyone meet the same problem? how do you fix it?