It’s not really a question asking for help, but I guess it was the most relevant category to put this in. It’s actually more of a bug report.
I just made a clean install of a v4.1.0. Everything went smoothly, except when I tried to update the email addresses associated with memberships.
Everything is configured properly, I received the emails with the confirmation links, but when I clicked on the confirmation link, it lead to a 404 page. That being said, the email addresses were properly validated. But this bug can still be confusing.
Let me know if you need more details.