i can find nothing on the web about how to handle your situation. Normally, I would suggest amending prior returns to show the PAL c/o. The IRS says you have 3 years (sometimes 2 years) to file an amended return if you are claiming a refund or credit. you are not. if you try, entering the entire PAL c/o on 2020, I'm not sure what the IRS might do and it could take 2 or more years if it decides to take any action. I would suggest you seek to help of a tax pro who could further research the issue or if you wait perhaps another member will post more definitive information.
