Ring Group -> "Confirm Calls" option not working at all. Not playing message, not waiting for 1 to be pressed

My Ring Group -> “Confirm Calls” option is not working at all. I have tried it in a few different RG’s and different scenarios, and it is just being ignored by Asterisk. It will just send the call through without stating any message to the receiver nor does it require 1 to be pressed. Can someone help me out please? Thanks.