The IsValid response of an IResponse deserialized with .GetResponse<T>() on a GetTaskResponse (that's a bit of a mouthful ) cannot be used or relied upon because it uses parts of the HTTP response in determining validity, such as HTTP status code, and the HTTP response details available relate to the GetTaskResponse.
The XML documentation comment on GetResponse<T> mentions this
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) cannot be used or relied upon because it uses parts of the HTTP response in determining validity, such as HTTP status code, and the HTTP response details available relate to the