PicketLink does not include Destination URI for an AuthnFailed Response. This is an optional attribute but is required under certain conditions PostBinding as per the SAML Spec .
From As per the spec "If the message is signed, the Destination XML attribute in the root SAML element of the protocol message MUST contain the URL to which the sender has instructed the user agent to deliver the message. The recipient MUST then verify that the value matches the location at which the message has been received."
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