Hi
With the previous version of Nuki, with the bridge, it worked great. And now on the same wifi network (2.4Ghz) with Nuki Pro 3 (firmware 3.4.10) I have the exact problem.
I tried to create a private wifi network just for Nuki (guests network) but experienced the same behavior-Incorrect password message and unstabelity connection to the network.
When I log into NukiWeb I can see that Nuki connects to the network sometimes, but it is very unstable.