By Julie J. -
Pebble 2 suffers from a bug in its firmware that prevents workouts syncing from the device to Swim.com. This bug is not activating the DataLogging process in some third party apps, including Swim.com. This process is necessary for saving/storing data on the watch and preparing it for transfer to a third party site. We do not have a solution to this issue at this time, and Pebble will likely never resolve the bug due to their buyout by Fitbit in 2016 and abandonment of support for the devices.