Apple Watch workouts don’t show on iPhone

You could also restart both devices, and then further check the following:

• On your iPhone, go to: Settings > Privacy > Motion & Fitness - check that both Fitness Tracking and Health are enabled.
• On your iPhone, in the Watch app, go to: My Watch > Privacy > check that both Fitness Tracking and Heart Rate are enabled.

If everything is already enabled, try toggling the option OFF and then back ON, just to make sure that the right value is really stored away and in active use.

Well that is a curious situation then. You can still see all of them on your watch, right? How is the ring closure looking then between them, is that different also? Finally, is the Health app showing the activities correctly?

Manage Health data on your iPhone, iPod touch, or Apple Watch - Apple Support

Most welcome - great to hear of your success with that tricky issue!

Get the most accurate measurements using your Apple Watch – Apple Support

Calibrating your Apple Watch for improved Workout and Activity accuracy – Apple Support

And reset your fitness calibration.