Push to talk key binding won't appear on ps5

Hey guys so I play on the ps5 im trying to set my mic to push to talk. When I put it on push to talk the keybind option doesn't not pop up im using the controller as my mic but I also use mouse and keyboard. Open mic does work while using mouse and keyboard on the controller. Any fixes 

Ps. All my mic settings in the ps5 are all good from what I gather