Jetpack is not currently connected to the https://www.fleksjobbernetvaerket.dk/ site, which is why you’re not seeing the site in your WordPress.com account.
There seems to be a problem with the site’s XML-RPC file, which is why Jetpack can’t connect. The XML-RPC file is blank instead of showing a XML-RPC?server accepts POST requests only message.
To fix that, I’d recommend checking the following:
1) Can you see the xmlrpc.php file at the root of your WordPress installation when accessing your site via FTP? If you don’t, then please try re-installing WordPress. You can do this by going to the Dashboard -> Upgrades page, then click the Reinstall WordPress button.
2) Do you use any security plugins that may block access to this file? If so, could you try to disable them? You might also want to check your site’s .htaccess file for any rules that might be blocking access to the?xmlrpc.php file.
3) Does your hosting provider block access to this file? If you don’t find any plugin that may block access to the file on your site, I would recommend that you get in touch with your host. If they only offer XML-RPC access by allowlisting IP addresses, then they will need to allowlist the Jetpack IP addresses listed here:
https://jetpack.com/support/how-to-add-jetpack-ips-allowlist/
4) Are any plugins, themes, or custom code on the site interfering with the XML-RPC file and causing it to be blank? This can happen if there is incorrect code in the plugin, theme or custom code, such as a blank space before the <?php line in the file.
Once Jetpack is able to access your site’s XML-RPC file, Jetpack should be able to connect to the site. You should then see the site in your WordPress.com account, and be able to use Jetpack Social to share posts to LinkedIn.
