Wemo polling for current_power_mwh is broken

I’ve setup an sensor that looks at the current_power_mwh attribute of a Wemo Insight switch. It’s not being updated regularly, nor reliably when the value is changed.

It seems to work for a brief time after starting HASS, but then no updates are shown afterwards.

Is there a way to make it update more frequently?

It appears that the “On/Standby Threshold” value for the Insight switch has to be modified within the Wemo app to get it to report regularly.