Doesn't allow WP to function

Hi, what do you mean by the following comment.

WordPress app won’t work with it.

Ask your developer to disable the Pingback Protection and you should be able to use the app if I’m not mistaken

Thank you. I will let him know.
Will let you know if it works.

@sfinn2013 if disabling the Pingback Protection fixes your issue bare in mind why your developer blocked it in the first place. Please read the following information for this feature added by the developers.

This setting will add a directive in your .htaccess to disable access to the WordPress xmlrpc.php file which is responsible for the XML-RPC functionality such as pingbacks in WordPress.
Hackers can exploit various pingback vulnerabilities in the WordPress XML-RPC API in a number of ways such as:
1) Denial of Service (DoS) attacks
2) Hacking internal routers.
3) Scanning ports in internal networks to get info from various hosts.
Apart from the security protection benefit, this feature may also help reduce load on your server, particularly if your site currently has a lot of unwanted traffic hitting the XML-RPC API on your installation.
NOTE: You should only enable this feature if you are not currently using the XML-RPC functionality on your WordPress installation.

Thanks for your help mbrsolution and d0r1anweb.
I have just been in contact with my WP developer and everything suggested here has been done and my app has been working now for a few days