Connection problem

Hey there… I have Radiomaster TX12 MKIl ELRS, Radiomaster RP3 and pixhawk 6c Receiver is connected to tele1 port, serial port is configured accordingly with the manual. Binding is ok. I get telemetry from FC to Transmitter. Also in ardupilot after connection by USB transmitter also recognized and can be calibrated. After connecting battery ESC become beeping until I press safety switch on M8N. On ardupilot motor test is ok on all 4 motors. The problem is I don’t understand what I have to do to operate motors and ESC using TX12 MKIl ELRS, it just don’t see it at all. Maybe someone can give me some advice.
Here are some pictures
Connected receiver