Ring Doorbell 2 two-way audio issues

When I answer the doorbell an oscillating choppy sound comes from the doorbell speaker and everything I say is parroted by my iPhone. The person at my doorbell cannot hear me. I can hear them, but the audio is choppy.
iOS up to date.
Resetting device causes it to not work at all.
Removing and reinstalling the device does not solve the issue.
Mic is activated.
Resetting router did not solve the issue.