What are you trying to do? You may need to contact them directly for assistance.
While Northwestern Mutual Private Client Services does have the ability to import your information directly into TurboTax as they have agreed to offer that service to you, TurboTax would have no way of getting your number for you.
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Thank you for replying. I'm trying to import my tax statement per the TurboTax instructions, but there isn't a 24 digit code where TurboTax says there should be one. Here is a screenshot of the page I'm on. Thank you.