Vivosmart 5 - Walking not registering as standard in Garmin Connect App

I got a Vivosmart 5 for Christmas. This is my 6th Garmin 'wearable'. All previous ones, 'Walking' appeared in the Garmin Connect app as standard, I didn't have to do anything manually. 

My new Vivosmart 5 registered one walk on Christmas day at 14.37 and has failed to register a single walk since. I know I can record a walk manually which is fine when specifically going for a walk for exercise/leisure purposes, but I don't want to have to manually set it every time I walk from A to B. I've checked all the settings/activities etc. in the app. I've restarted the watch, but to no avail. 

Has anybody else experienced this is    sue with this device and know how to resolve it?