I did a test entering a W-2 with a California employer address, and Illinois in Box 15 with Illinois tax withheld in Box 17 but no Illinois income reported in Box 16 and the program did not have a problem with it although it wanted an Employee state ID number which I assume you also don't have. If that's the case, enter the Federal EIN for the Employer's state ID number. That would be the same number you listed on the first W-2 screen for Box b.
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