Client Credential flow with JWT private key assertion failing

I am using ExampleOIDCProvider to setup OIDC IDP. Trying to get access token using client credential flow with jwt_private_key and jwt_client_secret assertion. However it is failing with "invalid_grant" error.
When I debug the component space.oidc nuget, found that ClientConfiguration is always null in TokenSecurity class while calling this code

IList issuerSigningKeys = await tokenSecurity.GetIssuerSigningKeysAsync(includePublicKeys: false, includeSymmetricKeys: true);

I don’t see if ClientConfiguration is ever set for TokenSecurity class.
If anyone can help me to understand the process here please

I presume you mean private_key_jwt and client_secret_jwt.

It’s most likely some sort of configuration issue.

Please enable OpenID trace and send the generated log file as an email attachment to mentioning your forum post.