Ready For supports Miracast-compatible displays.
When the external display is available under Wireless, select the display.
If the external display is not found, check that the display is on, or try restarting the display.
Some TVs (including older Sony TVs) don’t support Miracast while the TV is connected to a Wi-Fi network.
If you experience issues with a wireless connection, try the following:
Use a video-enabled USB 3.1 USB-C cable or USB-C-to-HDMI cable to connect phone with external display.
If the external display doesn’t detect the phone automatically, change the display’s input to the port that’s connected to the phone.
If the HDMI port on the display is obstructed, use a male-to-female HDMI port extender to connect the USB-C to HDMI cable to the display.

Some USB-C cable and adapters are not symmetrical. If you experience an issue, try reversing the connector.