I've a new MBP, which connected fine to all WiFis until a few weeks ago. Does anyone know what I can try to resolve the issue? The error says "The Wi-Fi network ... could not be joined. This is what I've done so far: - Tested multiple WiFis on 2.4Ghz (5Ghz works fine) - Checked if passwords are correct (works by joining with an iPhone) - Reset PRAM and SMC - Just for the sake of it, changed MAC address (but there is no MAC filtering enabled..) - Created a new location and used the assistant to connect (here the error said "password is incorrect"). I'm running macOS Sierra 10.12.6. Appreciate any help.