This is what is in the manual stated:
So I think you did everything right.
Have you ever restarted your Homey or even better, did a PTP?
Have you checked in Developer Tools → Z-Wave if you have any unknown nodes? If so, try removing them first.
Have you checked in Tools to see if you have any unknown nodes like this one?
If so, try to remove them first, restart your Homey, I think a software restart is enough, and then try to add the controller again.
If it still doesn’t work, include the controller in close proximity to Homey, at a maximum distance of approximately 2 meters.
