We are on the trial version until we are more able to evaluate being able to perform some activities via the API such as changing a password.  I can successfully connect to the API to login, check validation, any methods that do not require the AuthUserName.  For those that do require it, such as any update methods, I keep getting this error:

 

    Web service operation UpdateUser2 with parameters ... cannot be found.

 

I have searched the online help, the web, the forums here and no where can I find a solution.  I create a system admin user and have specified it's credentials but still, no dice.