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Last tested: May 3, 2018
This error points to an invalid certificate. The solution is to get the correct certificate from this section:
<X509Certificate>
ThisIsALotOfRandomCharacters
</X509Certificate>
And paste it into IdP Certificate in admin/saml like so:
-----BEGIN CERTIFICATE-----
ThisIsALotOfRandomCharacters
-----END CERTIFICATE-----
If this doesn't resolve it it's likely that the certificate is just invalid and that they need to figure that out.
This content is subject to limited support.