@luka2013 Can you please confirm what you are entering for the Facebook App ID?
The ‘Facebook App ID’ that you have the option to input in Yoast SEO under Social>Facebook is a specific ID number assigned to your Facebook application (if you have one). You can find additional information on registering and configuring your Facebook application ID here: https://developers.facebook.com/docs/apps/register/#app-id.
Please note that if you have not specified a Facebook app ID for your site this does not interfere with the ability to share posts on Facebook, and if you don’t have a Facebook application you can just leave the ‘Facebook App ID’ field blank. We also have more information on this here: https://kb.yoast.com/kb/warning-fb-app-id-hasnt-been-included-in-the-meta-tags/
