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You can also, or on IIS must, use the SP's RequestMap feature, applying an XML attribute, authnContextClassRef="https://refeds.org/profile/mfa", to a particular mapped location.

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Assume the SP is configured with the following <Errors> element:

shibboleth2.xml

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    <Errors supportContact="help@example.org"
            redirectErrors="http://example.org/error" />
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