Is client_secret_basic as authentication method supported in OpenShift Container Platform 4 OpenID Connect identity provider

Issue

• Our IDP will be upgraded and only offering the authentication method '"token_endpoint_auth_methods_supported":["client_secret_basic"]'. After the upgrade we found that accessing the OpenShift WebConsole is no longer possible as it seems that OpenShift does not support client_secret_basic in the OpenID Connect identity provider.
• It seems that OpenShift Container Platform 4 OpenID Connect identity provider does not discover .well-known/openid-configuration to evaluate token_endpoint_auth_methods_supported and understand what method is supported/offered. Instead, client_secret_post seems enforced.
• As per https://datatracker.ietf.org/doc/html/rfc6749#section-2.3.1 client_secret_post is no longer recommended and we are wondering whether the OpenShift OIDC provider does support client_secret_basic.