Cisco ISE authentication issues

Has anyone been able to get authenticated scans working on Cisco ISE appliances?
i’ve been able to ssh to our ISE appliances from our scan engines so i know they’re reachable. Using the same credentials, I either get authentication “unknown” or “no credentials supplied” in the scan history. I know ISE requires separate CLI accounts to the ones used in its GUI so created those aswell, still no success. Anyone have any pointers please?