So this is a typo in the application package identifier in the Google Developers Console.
As indicated in some comments, here are some more details: To support Google login, you need to specify the client ID https://console.developers.google.com by API and Auth / Credential In our case, we saw an error, because in the identifier the client that we created for the iOS application, we had a typo in the identifier of the application package. (Instead of com.companyname.appname we typed com.companyname.companyname)
I assume that there may be other ways to cause the same error, but one good place to check is the developer console ( https://console.developers.google.com ), just make sure that each field makes sense for you.
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