I am using iphone 11 pro Max Model MWF42CH/A in Pakistan. I am face an issue in Facetime. May facetime audio call option have been disable.

I am using iphone 11 pro Max Model MWF42CH/A in Pakistan. I am facing an issue in FaceTime. FaceTime audio call option have been disabled. I also have updated my phone to ios 14 beta 4. I have flash my mobile too but unable to enable audio call. Done Everything 😭. I think there is only One option and that is to sale this phone.