How is SAML2 CUSTOM AUTHNCONTEXT CLASS REF LIST expected to work?

Hello,

I thought I had done this the correct way but I'm unable to get it to work so far.

Incoming SAML request from trusted SP contains

samlp:RequestedAuthnContext Comparison="exact">
<saml:AuthnContextClassRef>id.elegnamnden.se/.../saml:AuthnContextClassRef>
</samlp:RequestedAuthnContext>

I have configured option "SAML2 CUSTOM AUTHNCONTEXT CLASS REF LIST=http://id.elegnamnden.se/.../loa3 in the SP config

and in Remote IDP in NAM I have set the option "SAML2 CUSTOM AUTHNCONTEXT CLASS REF LIST=http://id.elegnamnden.se/loa/1.0/loa3 and Requested by "Use Types" and Context Comparison to "Exact"

Which if I understand things right, that would redirect users to external IDP for authentication, but it don't.

I see this error in IDP catalina log file

"Warning: Invalid resource key: Authentication error: There is either no 'Local Card' or a 'Provider Card' configured for the requested contract [null]. No prefix!"

Any suggestions?

/Lennart