docker-surfshark: unable to resolve hosts

i installed this on my synology NAS as per the instructions. it appears to be running, but i can’t seem to confirm that it has successfully connected.

I connect to it using the Terminal tab. Run the sh command to get a new window. Then inside it run, curl ifconfig.me command. however the response i got was curl: (6) Could not resolve host: ifconfig.me

the logs don’t appear to be show any connection errors. how can i check that it actually is connected and working?

{
   "cap_add" : [ "NET_ADMIN" ],
   "cap_drop" : null,
   "cmd" : "",
   "cpu_priority" : 50,
   "devices" : [
      {
         "CgroupPermissions" : "rwm",
         "PathInContainer" : "/dev/net/tun",
         "PathOnHost" : "/dev/net/tun"
      }
   ],
   "enable_publish_all_ports" : false,
   "enable_restart_policy" : true,
   "enabled" : true,
   "env_variables" : [
      {
         "key" : "TZ",
         "value" : "Europe/London"
      },
      {
         "key" : "PATH",
         "value" : "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
      },
      {
         "key" : "SURFSHARK_USER",
         "value" : "**************"
      },
      {
         "key" : "SURFSHARK_PASSWORD",
         "value" : "**************"
      },
      {
         "key" : "SURFSHARK_COUNTRY",
         "value" : ""
      },
      {
         "key" : "SURFSHARK_CITY",
         "value" : ""
      },
      {
         "key" : "CONNECTION_TYPE",
         "value" : "tcp"
      }
   ],
   "exporting" : false,
   "id" : "be5a6540ef32b44c2b907711681b60fc1477cde854e69b0229441f898035947a",
   "image" : "ilteoood/docker-surfshark",
   "is_ddsm" : false,
   "is_package" : false,
   "links" : [],
   "memory_limit" : 0,
   "name" : "surfshark",
   "network" : [
      {
         "driver" : "bridge",
         "name" : "bridge"
      }
   ],
   "network_mode" : "default",
   "port_bindings" : [],
   "privileged" : false,
   "shortcut" : {
      "enable_shortcut" : false
   },
   "use_host_network" : false,
   "volume_bindings" : []
}