@Eric-Katzfey Worked! Thanks a lot

I recently purchased the PX4 Autonomy Developer Kit item from your company. As I already own an Spektrum DX6 RC controller and a SPM9645, I opted for the version without the remote control. Following the instructions provided in the link https://docs.modalai.com/voxl2-rc-configs/#spektrum-dsmx , I removed the pre-installed receiver and connected my own. I then proceeded with the remaining steps exactly as outlined.
When I power on the device, I can see the receiver's LED is powered and connected to my RC. However, the QGC is not recognizing it, I tried to restart QGC and didn't work. To ensure I followed the process correctly, I tested the same setup with my Pixhawk, and it worked as expected.