From time to time, a Garmin software release or another unexpected event will break the sync between your Garmin Watch and Garmin Connect. Since MySwimPro relies on this sync to send a MySwimPro workout to your Garmin Watch, this leaves you unable to send workouts from MySwimPro to Garmin.
If you experience this issue, execute the following steps:
Verify that you're running the latest release of Garmin Connect Mobile iOS.
In the Garmin Connect app remove your Garmin devices - More > Garmin Devices > select your Garmin device > Remove Device
On your iPhone go to Settings > Bluetooth > select your Garmin device > Forget This Device
If you have any other mobile devices (phones, tablets) nearby and paired with the Garmin, also do the same there - Settings > Bluetooth > select your Garmin device > Forget This Device
Restart iPhone
Restart Garmin
Place your Garmin in pairing mode - depends on model, but usually hold MENU > select Pair Phone.
Pair using Garmin Connect, not your phone's Bluetooth settings.
Follow the usual steps outlined here to send your workout.
Happy Swimming!