Unless the Hub's password has been changed, this could be the (known if not common) problem of the Hub having corrupted the password info.
A factory reset of the Hub might be the only option to attempt to regain access.
Regardless of VM notes on a reset, the RESET button needs to be pressed for a full 60 seconds to trigger the factory reset and then just leave the Hub to reset and restart.
This will revert the HUB to the initial WiFi SSID / Passwords. If the Hub's password still does not work a Hub defect will have to be reported to Support.