Hello Daniele,
It looks as if credentials have not been set properly for your project. How
did you set app authentication, exactly, and how did you ascertain it works
fine, as you mention? You can gather more detail by reading points a. to h.
at Step 1 on the ".NET Quickstart" documentation page. In fact, following
the whole example provided on that page may prove generally helpful in your
case.
The actual code example on this page is somewhat more elaborate than your
example:
// Define parameters of request.
FilesResource.ListRequest listRequest = service.Files.List();
listRequest.PageSize = 10;
listRequest.Fields = "nextPageToken, files(id, name)";
// List files.
IList<Google.Apis.Drive.v3.Data.File> files =
listRequest.Execute()
.Files;
You are encouraged to adapt this code snippet for your particular
situation, and post the results back here.
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