CUAV x7+ Pro with skydroid H12 Serial port not detected

I have a skydroid H12 controller I am using it with CUAV x7+ Pro flight controller. The Multilink modules UART I have connected too telem port 1 on the CUAV Module. I am using QGS app on the skydroid H12 for configuration, but no serial ports are found in it. I have verified all my wiring Rx-Tx, Tx-Rx and 5V and GND and SBus wires also I have done frequency matching and everything.

Do you mean No serial port appear in QGC?
Have you try using MP Android to connect?
Is H12 USB-OTG device?
Maybe this post interests you, you may need with HEQ app running before QGC or MP. Then use UDPCI to get the Telemetry data, a methodology similar to SIKI UniRC 7/7 PRO.

Likely, a serial connection + baud rate configuration from CUAV flight control to H12 air unit will do.

I installed the skydroid app instead from their website and it works fine and serial port is connected.

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