2. Verify that you are not using a VPN (virtual private network) or proxy server on your mobile device.
3. Accept the prompt that will appear on your smartphone to connect to the monitor's access point. Make sure your smartphone can connect to non-Internet and/or unknown WIFI networks from your system settings, or you can also try pairing with another smartphone. Some smartphone may refuse to connect to a Wi-Fi network without an internet connection.
4. If it still fails or the promt does not appear, reset the monitor. To do this, remove it from the wall and wait 10 seconds with the monitor disconnected. This is important to completely discharge all its electronic components. After this, reconnect it, check that the red LED lights up, and try pairing again.
To remove the monitor from the wall, hold the monitor firmly on both sides with your hands at the lowest part and use a little force to pull it away from the wall, wait 10 seconds and reconnect it as shown in the picture below (you can use a lever or flat-head screwdriver to pry it off):