Echo Show 8 mic not working

Hi There, I have installed the Ring doorbell 2nd gen and connected it with my Echo show 8. If I access the doorbell from the echo show manually (live view) the mic mic works perfect and i can talk to the person at the door. However, when someone rings the doorbell the feed automatically comes up on the echo show but I cannot speak to them. The mic doesn't work (I've pressed the mic button on the screen etc). Has anyone encountered this problem? If I say alexa talk to the front door the feed opens and the mic works but its only when someone rings the doorbell and the feed appears it doesn't work. Is it a bug I wonder?