Updated to macOS 15 yesterday morning. Since then have had multiple crashes of "idecachedeleteappextension" - 27 crashes over the last 6 hours. It's becoming a bit of a pain.
Have reported to Apple via Feedback Assistant.
After Updating to macOS 15 Sequoia I can no longer login to FaceTime or iMessage on M1 Max MBP. I am prompted to login to iMessage after rebooting but I just get a spinner. The same thing happens with FaceTime.