Replace any Task.Result calls with Task.GetAwaiter().GetResult()

[Tratcher]

There are several places where the auth handler has a sync and an async code path, but the sync path must call the async path and block (Task.Wait/Result).

"One last remark: you should avoid using Task.Result and Task.Wait as much as possible as they always encapsulate the inner exception in an AggregateException and replace the message by a generic one (One or more errors occurred), which makes debugging harder. Even if the synchronous version shouldn't be used that often, you should strongly consider using Task.GetAwaiter().GetResult() instead." - Pinpoint