Comment Plus – Facebook login is not working in subdomains

I installed the plugin.

I activated the plugin on individual sites ( and on the main site (

I have not activated the plugin on the network because some subdomains will be mapped.

I created the app on facebook as indicated initially by setting

for the app (



while for the app (



Now on the main domain .com site you can login with Facebook correctly and then to comment.

Instead subdomain can not in any way to run the plugin, the pop up facebook gives me the error:

Given URL is not allowed by the Application configuration: One or more of the given URLs is not allowed by the app’s settings. It must match the Website URL or Canvas URL, or the domain must be a subdomain of one of the App’s domains.

I tried to change various settings in the app facebook but the result is always the same.

I have to configure something in particular?

You can find the error to the following address

Waiting for a kind reply,

thank you and have a nice day