Thanks, this and previous answer fixed the issue.
Also, we didn't manage to add app.UseForwardedHeaders(new ForwardedHeadersOptions { ForwardedHeaders = ForwardedHeaders.XForwardedProto | ForwardedHeaders.XForwardedFor });, if we add this to Programs it fails compilation.
Also, trying to access https://dev-configurator-api.mtgcorp.com/.well-known/openid-configuration gives us this:
error "invalid_request" error_description "This server only accepts HTTPS requests."
If I fix that using RequireHttpsMetadata=false, we're back to square one with the original error
After applying these changes we get the following error: Object { headers: {…}, status: 400, statusText: "Bad Request", url: "https://dev-configurator-api.mtgcorp.com/.well-known/openid-configuration", ok: false, type: undefined, redirected: undefined, name: "HttpErrorResponse", message: "Http failure response for https://dev-configurator-api.mtgcorp.com/.well-known/openid-configuration: 400 Bad Request", error: {…} }
