I am using the Brevo forms to enable users to sign up for a mailing list. When the users submit their email, they do get an email asking them to click on a validation link to complete the sign up. However, when they click on it the first time, they are sent to an error page on sibforms.com, and they are not signed up. The error page says that the service is not available and to try again later. However, if they click on the validation a second time, they are signed up, and it sends them to the correct confirmation page. This always works, even if they don’t wait at all in order to do the second click.
Could you let me know how I can fix this, so that the validation link works the first time?