Yes. He should get back all his California withholding because his employer withheld CA tax in error if he never worked in CA.
As Tax Expert MaryK1101 said, set your son's California wages to $0.
- On the screen "Did you earn all of your income in California?" say NO
- On the screen How much of the $xxx from federal Form(s) W-2 did you earn in California? change the number to $0
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