Can't use Google voice through the earpods

Hi I’ve a pair of liberty air 2 pro AirPods and they’ve connected to my phone via Bluetooth so I can listen to music but I can’t use Google! like when I want to ask to make a call saying “hey Google” make a call, nothing happens I know you can use Google Voice to make calls ect when I use the settings in the app (press and hold for 2 seconds and it opens Google but on all my other air pods I could do that just with a voice command, I didn’t have to touch the pods