ERROR [] - <Error 
generating SAML response for service>  
java.lang.ClassCastException: java.util.HashSet cannot be cast to 

This is a bug. Please file an issue.

Ultimately what we'd like to do though is invoke MFA-Duo globally, and 
not via an application triggered policy. It looks like the CAS properties 
listed here may be relevant, but it's not clear to me how they should 
be used. 
Global triggers, that are not tied to principal or services, are not possible 
explicitly. Please file a feature request.

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