Invoice fetch for Facebook accounts are sometimes not working when it comes to the 2FA request. We are in contact with Facebook as we can not solve it from our side. We are still waiting for a reply from Facebook. An option is to set up an additional user with rights to access the invoices only which is not secured by 2FA. You find informations about this option direct under the following Facebook support URL https://www.facebook.com/business/help/442345745885606 Updates will follow here.