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Hardware Version :

Firmware Version :

ISP :

Have been using Echo Dot with about a half dozen TP Link smart plugs for a few months. Today, for no known reason, nothing is responding via Echo.

Alexa responds to all requests (for all six devices):
"Sorry the device NAME is not responding"

I CAN control all the devices from my Kasa app on my phone.
All the devices are listed under the Alexa web app
I restarted the ECHO
I used the ECHO/Alexa web app to "discover devices" (even though they all appeared)
I disabled the TP-Link skill, re-enabled it, discovered devices...

Still not working.

It is not exactly evident which product is failing here.
Can someone please recommend some troubleshooting steps or a fix?
Thank you