Please try the following in order:

• If you are using any Wi-Fi extenders, please temporarily turn them off, and try connecting again with the fused spur close to your main router.
• Please turn off 5GHz Wi-Fi in your router settings.
  Restart your router and wait for Wi-Fi to become active again.
  Try connecting again.
  If connection is successful, please turn 5GHz Wi-Fi back on, and restart your router again.
• If connection is still unsuccessful, AND you do have Wi-Fi extenders, please turn on the Wi-Fi extenders and try pairing again with the fused spur close to an extender.