WPMU multi domains PURGE

Hi,

I have a WPMU install, with 2 blogs :

1- https://www.blog.fr
2- https://com.blog.fr

Thanks to multi domain plugin, I mapped as following :

1- https://www.blog.fr
2- https://www.blog.com

The purge works on https://www.blog.fr, but not on https://www.blog.com. Indeed the plugin expects com.blog.fr to be cached by varnish, and not https://www.blog.com.

How to make WordPress Varnish plugin able to purge the cache of https://www.blog.com ?

Thank you very much !

https://www.ads-software.com/extend/plugins/wordpress-varnish/