Build only works with username and password in msbuild arguments

I have an issue with building to a new web farm. Currently it only works with the /p:Username=domain\account and /p:Passsord=secret arguments in the process template. I need to be able to call either a stored credential or figure out a way to bypass this. I am hoping someone out there knows of an argument to use that does not require the service account and password.

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Chris Jones