The Dell Warranty Tool, which can be downloaded separately, but also comes in the Dell Command | Integration Suite, is no longer working.
To be more accurate, the tool works just fine, but the service that it connects to is what is no longer working. This backend service was created a long time ago and is now being retired.
A new tool is still in the works but there is no current ETA. Sorry for the inconvenience.
*This is not an official Dell blog*