You have to make sure your notifications on the watch is on and on each individual app that you want to receive notifications on the phone, switched on.
Another option is make sure notifications on the watch is on even if the phone notifications is on. I would not 100% rely on a watch ,others may.
Go to security settings on the watch and click wrist detection off and u should get old notifications and calls. You can still switch off the ones you don't want by the phone app notifications.
Just a few ideas . It works for me.