I keep getting an error trying to access Calendar list

I'm trying to create code in C# for accessing Google Calendar.

In console.cloud.google.com I've enabled the API, added users en added the scopes shown in the image below.

In my web application I've run Install-Package Google.Apis.Calendar.v3.

In code, the following scopes are added

String[] SCOPES = new String[] {
"https://www.googleapis.com/auth/userinfo.profile",
"https://www.googleapis.com/auth/userinfo.email",
"https://www.googleapis.com/auth/calendar",...

I keep getting an error trying to access Calendar list WordPress ...