Hasn't worked for me in days, and prior to that, weight was showing up as the previous day in the Weight page, but correct day in Calendar page. Sounds like a persistent and critical failure that Garmin has yet to address.
IT is a problem that should take Garmin 10 seconds to correct simply a bad url (but it will take them weeks). replace the word weight by health so https://connect.garmin.com/modern/health worls