Help getting what looks and sound like no connection beeps

just built my first drone decided on a f550 everything good but one problem cant get motors to work with px4 please see video i know the motors work and the esc do tested them together via the throttle channel on the receiver. ive done everything i know of. see video below. thanks for any help you might be able to render.

i’m fairly new to rc quads been flying the RTF drones and decided to try to build one. now i’m stuck.