After submitting all combinations, my numbers (AGI and PIN) worked as of 2020-07-17.
We filed jointly for 2018 tax year with my spouse's SSN as the primary, and a self-selected PIN, using turbotax for e-filing.
We filed jointly for 2019 tax year with my SSN as the primary. (We need to change the primary for a reason.)
After several IRS rejections, I started a NEW tax file, NO importing from 2018, in turbotax.
I received the IRS acceptance using the 2018 AGI for BOTH (primary and spouse), and the PIN used in 2018 e-filing.
Best wished to all!
