But if you are a reader in the future, who is encountering the same thing:

The link you are provided in the confirmation email is a one-time link. So if you follow the link twice, or if you accidentally hit “reload” in your browser, or if your browser for whatever reason requests the page twice (view source, reload, network confusion, …) then the second time will give a “Not Found” error. It may be that you never saw the first successful load, even though it was successful behind-the-scenes.

Hmm, most of the time, people complain that they never get the email. But you seem to have received the email, but just couldn’t click the confirmation link. So you made it one step farther than most people do. Lucky you. ;-)

Don’t worry, having a “confirmed email” actually only allows you to receive “notification emails” from the forum; most of us have lived without those notifications for years. If you want to find out if someone has replied, just come here and check your notification bell at the website, rather than relying on email (which often get caught by spam filters along the way, so they don’t make it to you reliably, anyway).