There are several similar threads exists - the iOS widget does not show the load value (and watchOS app does not show the load in the app) when the inverter is set up “Position of AC loads“ = “AC output only“.
Widgets and watchOS app start to show the load correctly with “Position of AC loads“ = “AC input and output“.
https://community.victronenergy.com/t/widgets-load-absent/52427/6