Dumb question maybe, but in the Watch app on your phone, My Watch > Notifications, have you got “Mirror iPhone Alerts From” sliders on for the apps you want to get notifications for?
You could consider unpairing the watch and then re-pairing it to you phone. It’ll restore from backup but maybe that will resolve your issue (watch app, My Watch > All Watches at the top left, tap the (i) icon on your watch and use the unpair option).
Dumb question maybe, but in the Watch app on your phone, My Watch > Notifications, have you got “Mirror iPhone Alerts From” sliders on for the apps you want to get notifications for?
You could consider unpairing the watch and then re-pairing it to you phone. It’ll restore from backup but maybe that will resolve your issue (watch app, My Watch > All Watches at the top left, tap the (i) icon on your watch and use the unpair option).