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Sonoff S31 energy monitoring not working

Good day,


I received a two pack of the Sonoff S31 devices with energy monitoring.  However, the energy monitoring on one of the devices does not function.  The firmware has been updated to current.   The device will turn on/off using the app, but the energy monitoring statistics are zero.   


I have swapped the two devices around, and verified it does not show energy monitoring statistics with multiple devices.  Please advise.


Thank you


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