@Yvonne191 I've never had the option to select selfie in the guest requirements when they book, maybe it was something that was never rolled out for Australia.
I've got Instant Book on & require ID verification, profile photo, recommendation from other hosts & trip information. I also have it stated in my house rules that guests must have a profile photo of themselves (and I don't accept third party bookings). That house rule has been very helpful when I get a profile photo of a cartoon character, I just send my house rules to the booker and they either update their profile photo or cancel their booking...