Zend certified PHP/Magento developer

Varnish allow utm_source and cookies

I’m trying to track my users referrer in Magento but varnish remove all utm from social media.

I’ve removed the utm regex from the default.vcl file and now I get utms in my request but setting the cookies still not working.

I’m sure this is a varnish issue, because everything works pefectly when I disable varnish.

Any help, please?