If you have implemented CA SSO 12.8 SP02 as OIDC provider and IIS as OIDC client, please share the steps to implement and issues faced during the setup. Also confirm, is any wrapper class is required at application side (OIDC client) to process the Access token/JWT apart from web.config changes.
For R12.7 here was the setup for OIDC Provider, with apache oidc client :
CA SSO OpenID Connect Provider - with Apache OpenID Client
And then here was the setup for SSO OAuth2 Client talkign to the SSO OIDC Provider (again R12.7) :
SSO Client Federation Partnership to SSO OpenIDC Provider
And then Kim did revisit with R12.8 :
Apache OID Client and CA SSO OIDC Provider
Hope that helps.
Cheers - Mark