I have the same issue. What is the solution?
Update: my graphs are back! Checked between now and an hour ago, they’re back all of a sudden!
Agreed on this. The data is there but it's not showing on the mobile app, only.
Same problem here, Fenix 6x Pro and iPhone X. Got the watch 5 days ago, first day it showed the HR graph but nothing after that, it says I have to sync the watch. Did everything possible but didnt help. Already emailed Garmin.
Thought its just me and my watch...
Btw, otherwise loving the watch! Came from Suunto WHR Baro and Suunto 9 Baro and no words to describe in how many levels the Fenix beats Suuntos.....! Amazing stuff.
Same issue here, but then I also found something else when opening my device settings on connect.garmin.com.
It's next to the photo of my watch at the top of the page. Maybe it was there all along and I never noticed, but it does seem a bit strange.