Which type of router? If it can't connect, then you may have something called AP Isolation turned on and that is blocking the communication from the radio to the Maestro.
The security has to match the settings on your AP. Using WPA2 works and is highly recommended. You may want to test by turning off all security on the the Access Point.
I narrowed it down to the wifi not obtaining an IP address from the router
I was using WPA2 protocols but I there was a couple of minor settings of authentication types and I set these to auto and the Maestro now connects.
I ran the 5g wifi with no security first and the Maestro connected immediately - turning on security then allowed the Maestro to accept the password and away it went
This is unusual as its the first wifi device in a while I have had with these kind of problems
Sure would be nice to be able to set fixed IP's and see detailed wifi settings in the wifi screen