AzureADSamples/WebApp-WSFederation-DotNet — pull request #1 by vossad01 (2014-10-03 20:54:02+00:00)
Title: Removed unnecessary steps when registering app

The steps had you copy the Client ID but no later step use it. This causes confusion. I pasted it into ida:Wtrealm instead of the App ID URI in the confusion and was surprised when it did not work. Based on the exception I found that if I prefixed the Client ID with `spn:` it would work, but that is not the right solution per these steps.