I have tried four times to change my email address. Every time the system tells me it is sending a confirmation email, but when I click on the link I receive a message saying “Confirmation token missing or invalid” and my email address does not get changed. I am on a Mac (OS Sequoia 15.4.1, Safari Version 18.4).
Thanks for your bug report. There was indeed a bug in the system. The confirmation links should now work! Are you able to change your email now?