Thank you all in advance for taking time to read this question and answering. I've a 10.6 Federated ArcGIS Enterprise Environment with IWA Authentication using which I've deployed few WMS Services. For some reason services are not accessible through rest end point or through portal in a federated environement, I get the error as shown in the screen shots. The same services work without any issues when published to 10.6 standalone ArcGIS server. Any clue why this might be not working in Federated Portal Env. Thank you.