If there is an amount in Box 7, then box 6 would need a state number that meets the requirements of that state.
If you can't get a valid number for box 6 today, and there is no withholding in box 5, you can try leaving box 7 blank as well as 5 and 6.
Each state has its own requirements for the format of the state id number.
@JTaylor3
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