I have a Fenix 6x sapphire and am using a Google Pixel 3Xl with the Android Garmin connect app. The watch shows connected and you can sync it and it will show the "live" HR rate, number of steps for the day, current O2 rate, etc., but it will not save the data and record it to show in the details for yesterday, 7days ago, etc.,
I have uninstalled the app completely and re-installed it. You can see the last 7 days data on the watch. The data is being recorded on the watch, you can see it live on the Garmin Connect App but you can't see the historical data on the app other than what is there today.
I was having no issues and have had no issues until May 8th. I have been able to record this data from my Garmin 520 plus and my previous watch Garmin 3HR, and have been getting this data on my Garmin 6X until May 8th. then it just stops. The data is on my device but does not save onto my app.
Is this possibly due to a Garmin Connect app update? There have been several over the days according to my phone log.