404 page not found

Check for a plugin that does “redirections”, this is the kind of plugin to blame for these issues. Then deactivate it and try again to duplicate a newsletter, this should work.

Hi, sorry, I have no plugin “redirections”. Here is the link page : …?page=wysija_campaigns&id=13&email_id=14&action=duplicate&_wpnonce=6e12e9e42f

PierreD

We are still investigating this issue!

This should fix your issues: https://support.mailpoet.com/error-403-on-admin-ajax-php/

In case it didn’t work, ask your host support to disable mod_security on your website.