I now have two SPs (A Juniper MAG SSLVPN and an Apache-Shibboleth
implementation) that both return the title error when attempting to use
the SLO functionality. Looking at the SAML message being sent to the
IDP it appears to be a valid message and has the correct session IDs in
it. (I'm not a SAML expert, so maybe I'm wrong here)

I can't find any valid troubleshooting information on this error
Any ideas if it's something I misconfigured in the IDP or if it's
something that the SP is supposed to send with the request?

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