Recently, about an week or so ago, Shelly introduced Shelly Plug M Gen3 so this seems to be brand new device. I have bought 16 of these but I am having problem to add them to HA. Basically when I provide IP address of the device in HA it forward to password message box but then i try to enter correct password i get “Invalid authentication”. With that password i can login into administration panel. I have tried to add few of these to HA but all get “Invalid authentication” message when I try to provide password.
There is also 1.8.99-plugmg3prod0 in the footer of Administration Panel.
I have noticed that when there is no password for Admin Panel set then you can add the plug to HA without any issues. Just password protected Plug M Gen3 seems to fail.
The upcoming firmware version 1.8.0 introduces changes to authorization that are currently not supported by aioshelly package and Shelly integration. You must disable the password on the device to integrate it with Home Assistant.