IdentityServer4 Correlation Failed Error with External Provider

Question

I am attempting to integrate Ping Federate as an external OIDC provider for my IdentityServer4 instance. When I initiate the external login flow I am getting the following e

Answer 1

Add this in the configuration in startup.cs. Its an issue with going from http to https.

app.UseForwardedHeaders(new ForwardedHeadersOptions
        {
            ForwardedHeaders = ForwardedHeaders.XForwardedProto
        });