You cannot take an other-state credit on a 2019 return for taxes that were paid for 2017.
If you were an AZ resident with CA income in 2017, and you failed to take an other-state credit on your non-resident 2017 CA return, the remedy would be to file an amended 2017 non-resident CA return.
If you were a resident of some other state besides AZ in 2017, the situation might be different. That's because CA has "reverse credit" with only a handful of states.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
