Hello,
In fact, the Nuget Package is just not support goole authentication on ios/Android, you could use Xamarin.Auth to implement this part of function.
You can refer to .NET quickstart and Google Sheets API to get the sample about how to use REST in C# and REST API reference.
Here is the sample code that I've tested.
In addition, don't forget to add the following code into your MainActivity:
global::Xamarin.Auth.Presenters.XamarinAndroid.AuthenticationConfiguration.Init(this, savedInstanceState);
global::Xamarin.Auth.CustomTabsConfiguration.CustomTabsClosingMessage = null;
Also, you need to create a activity: 195102-activitycustomurlschemeinterceptor.txt
Best Regards,
Alec Liu.
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