There is an old thread for this that has been disabled but this problem seems to be back. I just setup my new Epix Pro and the EKG required 2 step verification. The issue is I use SmartScaleSync to sync my weight from my Withings scale to Garmin (only reliable way to do this because Garmin refuses to support Withing's sync and the MyFitnessPal workaround is unreliable).
The 2 step verification seems to have broken the sync and now I cannot remove it. The toggle cannot be set to Off. This was the same issue as the original thread that was closed.