I've tried disabling my adblocker, Firefox's Enhanced Tracking Protection and in the Page Info -> Permissions screen I've explicitly enabled Cookies while on the error page. Despite this, the issue persists.Your browser is configured to disable cookies. Anubis requires cookies for the legitimate interest of making sure you are a valid client. Please enable cookies for this domain.
I also noticed these forums were similarly protected by Anubis but for the forums it seamlessly progressed through the test with no user intervention required.