I am Unable to access the portal feature service which is shared with everyone. I can access the portal item with out using any credentials. But when I access the services from federated ArcGIS server rest end page it is asking for credentials. If I try to verify the sharing permissions in server manager I am getting the error "The service is owned by another user. The sharing properties can only be modified by the owner." But i am the owner of these services and I have published these services. Any help would be much appreciated.
Additional Information: ArcGIS Server version 10.6.1
Single box installation
I have also tried to change owner of the portal item and tried to login into manager with new owner credentials, but still getting the same error in while viewing the sharing permissions.