The functionality of JCV could be limited by the specific device.
My JCV image does not pop up, but if I tap the Next Turn indicator at the top left (and scroll through the turns if needed) the JCV does display normally.
So at the moment a manual step if I want to view it.
It needs the smaller 212x234 Street Pilot/Nuvi40/50 type JCV in folder Garmin\.System\JCV\.

Cyclops works OK but it could need a little more fiddling.
After following the steps to configure an unl for original encrypted poi, a camera icon did appear OK but no audible notification.
After messing with Proximity Alerts, Single vs Continuous and setting/disabling Aubile Driver Alerts, force stopping/restarting, the Audio did start working but I can’t confirm which step actually did the trick.

You can test all this in Navigation-Simulator but obviously you need to know where your camera’s are, and also the junctions with JCV as these could change. There are less junction views in the smaller file so you may not see all the junctions that you may be used to seeing in a device that uses the bigger file.

Both above in Australia