Yes I only used usb 2 slots as I know from experience with wireless mouse or keyboard that USB3 and 2.4ghz devices do not mix well together.
I used and extender cable but re-reading your post lead me to recheck things and the key was standing near the printer which was currently running on the wifi as I am recabling the house.
I moved it away and it worked!!!
What baffles me is that it works with the addon and not the the ZHA.
So the interferences are dealt by the addon but not ZHA? The error log isn’t very helping there.
I however looked for an explanation from what I understood and it would seem that the interferences causes disconnections of the (usb ? )port that are not supported by ZHA while they are best tolerated by the add on.
I am currious to get a more technical explanation there.
Anyway thanks for the help
If it works with the addon but not with ZHA try a longuer cable/ better placement and beware of any 2.4ghz source that may causes interferences!