Herelink & PX4

Dear all, I’m trying to use the Herelink with Holybro PX4 but it seems the air unit is not booting… The LED’s are still off.
The Airunit is connected to Telem1 and SBUS RC and the Holybro PX4 is running on Ardupilot on which I’ve configured Serial1 to Mavlink (1) and Baudrate of 57 000

Anyone else had the same issue? Any idea how to solve? Thank in advance

Herelink & PX4