I thought this was going to be more straitforward than what it has actually been.
I installed all my tapo devices, and added them to my network with the Tapo app, and working well...
Then tried adding it to hubitat as matter devices, adding the matter code, but it has been a headache... I was only able to add 3 out of 9 switches/dimmers, and cant find a way to add them. I tried reseting then, restarting them and no luck...
Best guess: Your non-detected devices have NOT been properly installed to Matter. Part of the Matter install is assigning a Local IP address. Since the devices not working do not have a Local IP address (i.e., same segment as your hub), they are not detectable by Hubitat nor my integration.
You will need to reset the devices (look on web) then install to the base Matter Hub and then to Hubitat.
Even if they are all working with the TAPO ios app? All were installed the same way... is it maybe because I have my wifi network built with 3 eero devices, and the hubitat connected via LAN to one of them?
Initially I just added the switches directly on t he TAPO app (not through Alexa) and then within the TAPO app, get the Matter code (which was the same as in the sticker that came in the box) and added it to Hubitat... it work for 4 out of 8 switches... the other were impossible to add this way.... So I then reseted them, and added them in Alexa firts (as the instructions here on hubitat) and then get a new matter code to add it to hubitat and it worked with no issues... apparently t hats the correct way, whats weird now is why it worked the other way for those 4 and not the other 4...