To get the Device SN press the Forward
key on your device when the Settings
message is displayed.
Depending on the device model, you may need to press the Forward key more than once until the SN appears.
See your device's user manual (The Settings mode
chapter) for further details
Insert the whole Serial Number with hyphens.
You cannot associate more than one account to the same Device SN.
This procedure is not applicable to older atLEAF+ devices, please see this page