ClickOnce Deployment Manifest - publisherIdentity tag

Using: Microsoft.NET 2.0 application built with VS.2005

I have been searching for some documentation on the xml tag
publisherIdentity in the clickonce deployment manifest - and cannot
find any documentation on the tag. I believe if I can set this value
I will be able to resolve my ClickOnce deployment issue.

Only document found:
http://msdn2.microsoft.com/en-us/library/k26e96zf(vs.80).aspx
http://msdn2.microsoft.com/en-us/library/acz3y3te(vs.80).aspx

I have a ClickOnce application that is being publish from our QA
environment to our UAT environment. I have publish the ClickOnce
application as a Trusted Publisher. But when the application is
launched in our UAT environment (signed with a valid CA issued
certificate using mage). I receive a security warning (user can click
Install or Don't Install) before the user can install the
application. The only difference between UAT and QA is the
certificate (which is valid) and the environment (QA vs UAT).

I have followed the instructions in the MSDN article - but I have no
resolutions.
http://msdn2.microsoft.com/en-us/library/ms996418.aspx

Any help would be appreciated.
Kam