OIDC RP plugin not finding client ID

[Wessel, Keith]

I'm obviously overlooking something very basic here.

I've got a fairly vanilla installation of the OIDC RP plugin that I want to use to proxy to a single OP.

I've set idp.authn.oidc.rp.provider.proxyIssuer, and the IdP is successfully fetching OP metadata according to the log.

I've set idp.authn.oidc.rp.client.clientId and idp.authn.oidc.rp.client.clientSecret and even explicitly set idp.authn.oidc.rp.provider.discoveryRequired=false to be sure. And, even though it shouldn't matter, I've removed spaces from the equal signs in any of these properties though I know the IdP will trim whitespace.

But still, the log tells me this when I try to authenticate:

ERROR [net.shibboleth.idp.plugin.authn.oidc.rp.impl.InitializeOAuth2ClientContext:156] - Profile Action InitializeOAuth2ClientContext: No client_id found from profile configuration

Any thoughts where else to look? I'm feeling rather silly at the moment that I can't get this working.

Thanks,
Keith