Unable to connect with Qgroundcontrol | Multi-Vehicle Simulation

I am trying to run the multi-vehicle simulation and I can see the active mavros node for each UAV. But when I open Qground control it does not detect the UAVs.

here are my commands:-

cd Firmware_clone
git submodule update --init --recursive
make posix_sitl_default
make posix_sitl_default sitl_gazebo

In the above last command gives error. So I skip that one and source environment before launch the file for multi-vehicle simulation

source Tools/setup_gazebo.bash $(pwd) $(pwd)/build/posix_sitl_default
export ROS_PACKAGE_PATH=$ROS_PACKAGE_PATH:$(pwd):$(pwd)/Tools/sitl_gazebo
roslaunch px4 multi_uav_mavros_sitl.launch