Answer calls during exercise

While riding my bike I have Bluetooth headset connected to phone.

My Garmin fenix 7 is connected to phone. 

When receiving a call the screen in Fenix displays a notification asking to answer call. 

The problem I have is that any option to answer the call is unavailable. 

As I am doing an activity with the Fenix, so the touch screen Is disabled. 

I've tried all buttons on the side of the watch, but none answers. 

Can someone please guide me?