FPV drone not responding to remote control?

Hello everyone,

I have a Speede Bee f7 v3 as a flight controller, a DJI O3 air unit and a DJI Controller 2 with DJI goggles 2.

Now I have the problem that even if the remote control shows a reaction in beta flight and I have also set the button for the arm, nothing happens when I take the cable out of the drone.

The only thing that happens is that when I press the arm button on the flight controller a blue LED flashes very quickly one after the other.

I would be very happy if someone could help me.

Thanks in advance 👍🏽