I get "Not a valid serial number" even tho the SN listed matches that of my ISY. Also tried to Add product option above the Action tab, but the Z-wave dongle is not listed in the product pull-down menu.
I just noticed that under the Product tab, it shows I have an ISY99i/IR PRO, not an ISY994i/IR PRO. I suspect that may be the source of my problems. I must have mistakenly selected the wrong device when I registered it 8 years ago. I tried adding an ISY994i/IR PRO, but get back "Error: Not a valid serial number".
I've submitted a ticket to UD support - awaiting their response.