Have you enabled DSHOT, upgraded to 16.7 dshot command firmware but the beeper function is not working on your ESCS?
You need to go into the CLI in betaflight and enable the tone.
Run the following commands
You can try different tones, anywhere from 0-5
Thats it! You can now test this by moving the beeper slider under modes ion betaflight or swithcing on your beeper switch on your remote.