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How do I find my MO Employer Account Number?

I received an employer tax number from my state but it is 8 numbers.  The program won't accept it because it is not 9 numbers and in the format 123456-78-9.   The state says that it is the correct number and account that I have, an employer withholding account.  Do I just put my number in there in that format and add a zero to the end?