No turn notification during navigation

I'm having an issue in my new Enduro 3.  I'm a long standing Garmin user as I had a Fenix 6X for a few years and then a Fenix 7X Solar for 2 years, so it shouldn't be a noob error or RTFM issue!! (At least I hope not) 

If I'm using navigation for a course on any activity type and I'm on any screen other than the map, I get no notification of a turn, either visually or from a tone/ vibration. The red guidance arrow rotates 180° once I go past the turn, then about 20+ meters later I get the off-course warning with a beep and vibration (so my watch tones and vibration definitely work).

If I'm on the map screen a turn arrow and distance counting down to it come up, but I get no vibration or beep when I reach it. This means I'm going to be missing turns unless I constantly keep the watch on the map screen (which I never do) and even if I do, unless I watch the screen constantly, I'll still miss the notification as it doesn't beep or vibrate..... 

I've tried routes I've used in the past which previously sent turn notifications from my Fenix 7X watch screen. I've also setup new routes using both Komoot and Garmin Connect (making sure turn by turn notifications are set to on in the route before sending to my Enduro 3) I still get nothing on the Enduro.

I even setup a round trip route on the watch.... I got no sound or vibration on the Enduro at any turn.

I've gone through all the notification options on the watch, even in the 'Focus Modes' settings options for activities and nothing changes sadly.

Surely it must be a bug!? Or am I missing something?