NJ Credit for NY Taxes - Not Working

I have an unusual situation for 2020.  My husband received a lump sum separation payment for an employer for which he left in mid 2019.  On the NY return, I had to calculate 4 years of previous taxes starting in 2016 on form IT-203F to get an average (?) taxable amount for NYS.  He did not live nor work in NY at all in 2020.

Do I still need to calculate the same tax credit on the credit for out of state taxes form in NJ?  If so, what amount do I use.  The instructions refer to the amount showing on the IT-203 for NY for taxable income.   Turbo Tax picks up that number, which is about 60% of the amount he actually received in that lump sum payment.

Thank you.