Tag url not follow subdomain category

Hello,

i have news.mydomain.com but when i create a tag for my article, the tag url is normal and not news.mydomain.com/tag/tagname .

How to make tag on subdomain as news.mydomain.com/tag/tagname ?

Thank you very much in advanced.

phoenix1977

http://wordpress.org/extend/plugins/wp-subdomains-revisited/