Invalid DN Syntax when using VBScript to create user accounts

I have a VBScript that creates user accounts based on input from an Excel spreadsheet. I want the newly created accounts in Active Directory to be displayed in <last_name>, <first_name> format (please note, I am not talking about the displayName attribute). I configured the CN column in Excel in that format but I receive an error saying "An Invalid DN syntax has been specified." How do I configured the spreadsheet or the VB code to allow the user accounts in AD to be displayed in the desired format?
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