First, if there are no entries in 17, you may leave the entire box 15 and 16 blank, as well.
Your state department of revenue will be able to easily identify your employer from their 9-digit federal EIN, so the state ID number is a little redundant anyway, but is still a way that your state tracks employers in their internal state computer system.
In Utah, there should be 11 numerals followed by wth with no dash. Last year it required the wth in capitals but this year I have been seeing taxpayers succeed with it as lower case, so they much have changed. If your first 11 characters are all numerals and no zeros or letter "l"s, then try it with 11 digits of 9 and then wth or 99999999999wth and see if that will go through.
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