Irule can't resolve IP address

I'm testing F5 LTM 11.6 in Amazon AWS.

I'm trying a simple irule:

when HTTP_REQUEST { set sts [call /Common/HSSR::http_req -debug 1 -uri "; -tag "getIP" -rbody rbody] log local0. "server returned status=${sts}, content=${rbody}" }

The http_req is not working and I'm getting: err tmm[9160]: Rule /Common/a_test : getIP :59364: http_req cannot resolve httpbin.org to IP address info tmm[9160]: Rule /Common/a_test : server returned status=555, content=

I configured the DNS but still same issue. From the F5 LTM box i can curl the http://httpbin.org/ip.

What am i missing?