I recently purchased a pair of HS100 smart switches, they both initially set up without a problem.
I had to change the name of one switch due to it being moved to a different room on the same network and phone (Samsung Galaxy Note 8)
After I changed the name the switch displays "Local Only" on the phone app.
When I enter the device settings on the phone app to switch the remote control on an error message pops up that says "failed: invalid device"
I have removed the device from the app, removed the entire app, reset the device to factory state over and over, even rebooting my phone between tries.
Nothing has worked so far to fix the issue and on looking at other posts I see I am not alone with this issue.