using something other than entityID to identify SP to IdP

[Liam Hoekenga]

We've got a vendor who use the same entityID and ACS across several,
unrelated instances of their SP.  Each of these instances has it's own
hostname, from which the authn request originates.  We were trying to
figure out of theres anything available in the IdP 3.x contexts that could
be used to identify specific instances.

I don't see anything in the authn request, and referrer isn't exactly
reliable / trustworthy.

any ideas?

Liam
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