Pennsylvania taxes RSUs if you live or work in the state during part of the vesting period, even if you don't reside in that state when the award is taxed. You will have to pay the taxes to Pennsylvania but you will be able to claim a credit on your California tax return for any taxes paid for the same income. (Credit for taxes paid to another state.) You will want to complete the Pennsylvania (nonresident) state tax return first, then the California to get the correct credit.
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