We working on a resolution for this with Edge devices and compatible wearables.
I own an Edge 830 and just got also the new Fenix 6.
It's very annoying that Garmin connect does not know to sync the information between the devices.
Horrible
+1 for this issue, this is the only reason I don’t buy a new fenix 6 yet. Please fix it Garmin! Thanks!
Two months now. My 935 AND 830 still don't match on training load: 

Garmin-Matthew can you give us any update this? We can see things are in progress but any idea of how long we need to wait??
I have exactly the same problem. Edge 1030 and Marq Athlete show two different training load and status. Probably both are wrong if neither of them consider my whole training. I’m really lost. Would it take too long to fix this?