Initial Smoke/CO Listener Test Failing with Kidde i4618AC Smoke Detector

Hi - I am installing a Ring Smoke/CO Listener and cannot get past the initial testing step. The detector is a UL listed Kidde i4618AC wired smoke detector which is emitting 3 beeps and nothing else, voice or otherwise, so it *seems* to be a T3 alarm. I cannot find a compatibility list, so I'm wondering whether any other users (or Ring employee monitoring the forum) knows whether that particular Kidde model is compatible. Thanks.