Web preview - 403 Forbidden Nginx

Hello,
I have some issues with the web preview feature. The preview is set as default quick preview, but it doesnt work. When Im trying to access it, I have a 403 forbidden error from nginx.

The url looks like that :

http://xxx.xxx.xxx.xxx/plesk-site-preview/domain.tld/xxx.xxx.xxx.xxx/

I tried to find an error in the logs of the vhost and in the main error log of nginx, but didnt found any.