Thanks for your help
I moved my 2nd access point closer to the switch and tried the New Device as you suggested and it worked.
I have two more switches downstairs but they still do not work. So I am wondering if I need more access points. I believe I have bridged the 2nd phase which I thought would be enough, but clearly something is missing. Our house is about 2500 square feet. How many access points would I typically need (if that is in fact the issue).
I am not sure if this is related, but when I start up the UDI console, it reports that it can not communicate with any of my lights, but when I try to turn them on/off via the console, they do work - is this related?
Thanks for your help