Fitbit has experienced a sync glitch today, causing statistics to be lost and preventing users from logging into their accounts. Pixel Watch users are also unable to log in to Fitbit to sync their sleep and resting heart rates.
In terms of statistics, the data is grayed out after opening the mobile app, which includes steps, distance, activity time, heart rate, calories and more. During this downtime, as long as you do not reset the Fitbit device, these health and fitness data should not be lost, you can wait for the system to recover and resync again.
The DownDetector website shows the Fitbit website starting at 12:30 p.m. PT and the problem persists at 3:30 p.m. PT.