Hi everyone! Lately there have been several reports of the MMR converter not functioning correctly; it appears that MapMyRide/MapMyRun is by default setting new accounts and new workouts to private/friend-only. To ensure my tool can properly parse your workout, please be sure to set the workout to public, even if only for a moment to convert it. Once it is converted, you can easily change it back to whatever permission you feel most comfortable using.
Thanks!