Please follow below steps to fix it.
(1) Make sure your Windows device supports Miracast by checking the information that came with it
or by going to the manufacturer's website.
(2) Check the firewall settings on your office PC: Please add a firewall rule with a source and
destination for ports 7236, 53, 67, and 68 using the IP address 192.168.168.1 to allow screen
mirroring.
(3) On your PC, make sure Wi-Fi is turned on.
(4) To remove the device, select Start > Settings > Devices > Bluetooth & other devices.
(5) Move your Windows device closer to QP30 - QCast Mirror HDMI Wireless Dongle