Users receive a verify email address on sign-up and 80% of the users end up reporting that they reach a error page when they try to verify the email.
This was discussed and closed here even though it was not remediated: https://community.auth0.com/t/verify-email-address-goes-to-error-page-despite-being-verified/195938
Same here: https://support.auth0.com/center/s/article/Verification-email-error-message
It is extremely annoying that we get daily complaints from new users that they meet a “Error page” when they click on the verify email button in their inbox. Even though you explain the reason behind it is that they click the button twice it is still a very present issue that we cannot handle on our side and you at Auth0 have to handle. This has become extremely frustrating for both us and our users.