Thank you!

Here is a list of devices that are compatiable with the M9 https://www.tp-link.com/en/Deco-M9-Plus/compatibility/

Is anyone using the Deco M9 or SR20 for that matter for home automation? What kind of stuff are you doing? I'm in the market to buy the M9 but curious on all the functions the smart hub features. Can...

Correct, it sounds like you will have to control the light on/off with the cain on the fan. Unless you want to go to the expense of running more wiring and another switch for the light to run...

It does sound faulty to me. You could try that extender just for testing though.

Try resetting one to factory settings and setting up again. That helped when i had issues on one of my plugs