I'm having trouble connecting my WeMo light switches to the WiFi. Even after a hard reset, it doesn't like the password.
@robby-rash It appears that the password has nothing to do with it's ability to connect. The devices will not connect to the guest network either.
It seems that this issue is extended to my wireless printer as well. (HP LaserJet1100). Neither the manual setup will allow a connection to the router or the WPS setup. With the manual setup for the printer, it tells me that the credentials don't match even when I try to connect to the guest network that doesn't have a password. At this point, if half of my devices can't connect, I'm swapping this out for the Google solution for mesh.
Please try the following:
Amplifi App -> Router icon -> Wireless -> Wireless Security -> change WPA2 to WPA.
This should solve connectivity issues with some non-WPA2 clients.
Google WiFi only supports WPA2 so you'll have the same issue most likely.