“The phone would keep dropping the call within a second of pressing the call button, which occurred for three attempts.”
Google and Microsoft “fixed” the Pixel 911 bug in early 2022. One Reddit user has since compiled over 20 new reports of failed emergency calls, across carriers and Wi-Fi calling. Google hasn’t explained it. The advice is to schedule a test call with your local 911 center, and a passing test still guarantees nothing.