SP error: Unable to establish security of incoming assertion.

Wed May 8 08:05:29 EDT 2019

2019-05-03 15:59:28 WARN Shibboleth.SSO.SAML2 [2] [default]: no metadata found, can't establish identity of issuer (https://XXXXXXXXXXXXXXXXXXXXXX/idp)
This is almost guaranteed to be a misconfiguration on the SP side.  I think you set the entity ID of the SP to be the same value as the entity of the IdP.
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