Wordpress Wordpress getting 403 error

I am having issues with some plugins that require direct access to the PHP file under /wp-content.

For example I am using this plugin - YITH WooCommerce Social Login

1. It has a callback URL that is a direct PHP file - https://my.domain.com/wp-content/pl...social-login/includes/hybridauth/facebook.php
2. The entry file for authentication is - https://my.domain.com/wp-content/pl...h/?hauth.start=Facebook&hauth.time=1567588990

Both returns a 403 Forbidden error.

Also to add-on I am using Facebook Chat plugin and that too doesn't work. Error is related to

Refused to display 'Facebook in a frame because an ancestor violates the following Content Security Policy directive: "frame-ancestors Facebook - Log In or Sign Up".

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I used the same plugin and setup on an Apache server and it works. So I am guessing it has something to do with nginx permissions / URL rewrite. I am new to nginx and need your help on this.

Many thanks in advance!

 

Thank you @eva2000 I will look at it. As for the iframe blocking issue, is it related to that too? Or I need to allow the domain manually using X-Frame-Option?

 

Thanks @eva2000, I am able to solve the 403 issue with the guide you provided. As for the frame-ancestors issue, it is a configuration problem with Facebook side. All sorted out now.

Thank you!