Confirmation token não é válido

Já testado com algumas contas de e-mail, após o cadastro não é possível confirmar, algum problema no processo de auth.

Start by reproducing the confirmation-token failure after account registration using the reported email-account cases, then trace the signup and confirmation flow. The issue provides no file, test, or entry point, so first identify where authentication handles token creation and confirmation; done means a newly registered account can be confirmed successfully.

Written by the indexing model from the issue text.