Hi,
There is some kind of security issues on your server.
The response from your server : 403 Forbidden
Can you try this solution?
-https://stackoverflow.com/questions/17076893/apache-403-forbidden-when-uploading-files
More information about the error
-https://www.hostinger.ph/tutorials/what-is-403-forbidden-error-and-how-to-fix-it
Our IT department discovered this plugin is trying to access an Ajax file located in a wpadmin folder. That folder unfortunately is blocked for security reasons. Is there a way around this?
You need to allow admin-ajax.php this is how the ajax works on wordpress, most of the plugin use this.
You may try & add this in your .htaccess file.
<Files admin-ajax.php>
Order allow,deny
Allow from all
Satisfy any
</Files>
