When trying to update my About information on my Team, it gives me the error (No Tag Provided)

There is no Team Tag yet, and when I tried to put a placeholder, an _, it stayed and I can't seem to be able to remove it.

Any support with this?

http://www.gametracker.com/clan/phoenixkf/

(Now its showing as Phoenix Team _ when opening a web page)

You should be able to use an empty clan tag now when editing your clan information. I've updated your clan with an empty clan tag.