Permission error removing Facebook Page Tab width Facebook PHP SDK

Permission error removing Facebook Page Tab width Facebook PHP SDK

I'm trying to remove a Page Tab from a Facebook Page with Facebook PHP
SDK. I have requested manage_pages extended permission for the app.
I'm calling the following:
$facebook->api('/PAGE_ID/tabs/TAB_ID', 'DELETE');
And I get the following error:
(#10) Application does not have permission for this action
Using Graph Explorer the result is the same. Can you please help me?
Thank you.