sendHttpGetRequest in OH 5.1.1

This code isn’t working but the logging of the URL (MonkeyFullURL) works when I cut/paste it into a browser from the logging.

Is the sendHttpGetRequest syntax technical correct?

logInfo("MONKEY", MessageRemind)
var String MonkeyFullURL = MonkeyBase + MessageRemind
logInfo("MONKEY", "MonkeyFullURL is " + MonkeyFullURL)

var MonkeyOutput = sendHttpGetRequest(MonkeyFullURL, MonkeyHeaders, 3000)

logInfo("MONKEY", "MonkeyOutput from sending was " + MonkeyOutput)

MonkeyOutput comes back as null but it should come back as → {“success”:true,“message”:“Request received.”} ←

Maybe this service (Voice Monkey - Sign In) needs the user-agent defined in the header?

Best, Jay