Do always attach a copy of the report template you are experiencing an issue with or have a question about, and always identify the exact field and its band. This way I am not guessing where you may have placed a field, or what is occurring, and able to see from the details you provide exactly what is occurring.
Do attach a copy of the report template, identify the field that script is tied to and what band it is in.
The reason why your script was not working was that you had identified the band as DetailReport, whereas in your report template the band where the Labor fields are in the band called DetailReport3.
If you edit your script to use DetailReport3 instead, then the user name will display.
I liked your use of the combination string - I’m sure other AyaNova users will see how you used it here and will now also use it in their custom report templates.