Google Nest SDM

This is the one.
Homey Community Space
The other one is crippled and not usable anymore.

You seem to use the Windows installer (not the Mac version, right?):
Possible party poopers:

  1. Did you temporary disable the firewall? Your pc / mac must be able to reach your Homey on your network, right?
  2. Did you temporary disable all viruscheckers and the like?
  3. Temporary disable any pihole, adblocker, anything like that, which can influence your network
  4. Longshot, but maybe CGNAT should have to be disabled