Help! How do I determine which state I was a resident of?

You do not need to file an AZ return since you did not work or earn income in AZ.  File a part year return for MO.

Thanks! However my W2 shows my AZ income to be the same as all of my income for 2022 and shows no MO income. I called my company, and they say they are sending me another W2 which will show my AZ income = my MO income = all my income for 2022. When I asked them to explain that apparently illogical statement, they said they are escalating the issue to explain their logic. 

Wait---now the story changes.  You said you were laid off and did not work in AZ and just lived with your parents while you looked for a job.  Now you say you have a W-2 with AZ wages on it.    smh

All that is true. Never worked in Arizona. Worked only in MO in 2022. W2 shows income in AZ, maybe because when the company sent me the W2, I was with my parents in AZ. 

You could request an extension while you wait for a corrected W-2 from the employer.  If you owe tax, pay the estimated tax due now.

https://ttlc.intuit.com/turbotax-support/en-us/help-article/internal-revenue-service/file-irs-extension-form-4868-turbotax-online/L2rDBZJtx_US_en_US?uid=lgmgw4u5

Thanks again! If I don't receive a revised W2 later today as promised, I think I will file my Federal return as I will get a hefty refund on it, then file an amended return later on. Over the phone, my company told me that the corrected W2 shows AZ income = MO income = Federal income!! When I asked them to explain it, they said they are escalating the matter within the company. 

I received the corrected W2, which shows AZ income = MO income = Federal income, and withholding of state taxes both in MO and AZ. While I have asked the company to explain why AZ is on my W2 at all, I think I will file MO taxes as a resident (worked for 7 months there before moving to AZ to stay with my parents temporarily as I look for a new job), and file AZ taxes as a non-resident. Does that make sense? 

By chance were you a remote worker?

Thanks, MaryK4. No, I was not a remote worker. 

I decided to file as a part-year resident of MO and a non-resident of AZ. Since I had no AZ-sourced income, TurboTax concluded that I owe zero tax in AZ and that I should get my entire AZ tax holding back as refund. My tax holding in MO was short, so I will pay the balance today. Overall, this combination gets me the highest overall refund, and it seems logical to me. 

Yes, that sounds correct since you did not work in Arizona.