I'm sharing with you a TurboTax FAQ below that may help you out. You'll see the format with which the control number must be entered. Maybe that will help? The FAQ also says that the use of the control number by payroll is optional. If you can't "fix" the issue by using this information, I'd probably just leave it blank or use the suggestion of just using random numbers in a certain order. You'll see this in the FAQ.
I have no Box D or control number on my W-2
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*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
