Notifications not working Iphone X

Hi,

Have my S20 all set up, linked to apps (Garmin Connect & Garmin Golf) and can see everything connected.

The only thing not working is text notifications (and presume also email/calendar).

Have turned App notifications on in banner, screen, etc  in iphone settings. 

Notifications turned on in S20 menu.

Have rebooted phone & S20, reconnected, etc and still no joy

Any suggestions?

Thanks,

Ash