Locating Pedal ID on RS200 pedals

I read the other threads, but don't understand the answer.

My pedals show up as a device on my Garmin Connect account, but they are not synced to my IOS device.

When I try to sync them, it asks for a seven digit Left Pedal ID.  I can't find any Pedal ID on the pedal.

I do have the serial number of the device that displays on the Garmin Connect App.