Problem with /idp/AuthnEngine

[Seth Ristow]

We are attempting to use Shibboleth as an SSO solution for Office365. We are already using it for Google Apps and several other Shibboleth SPs. The difference is that all of our other SPs have our users log in to the page at /idp/Authn/UserPassword, while Office365 uses /idp/AuthnEngine. When submitting the form on this page, it appears from the logs that it does not even attempt a lookup in the directory when coming through this path. Any thoughts on where I should start to look? 
Thanks, 
Seth Ristow 
Lincoln Public Schools 
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