@ozman1958
<<...when you file your 2020 tax return, there is a "rebate" area where you check it if you now have a Social Security number replacing the ITIN number. >>
this is not true. look at the link below and then look at the reconciliation form on page 57, question 2. It asks if you have a valid SS#. There is no check mark on this form related to an ITIN. (note: it's page 58 of the pdf file, but at the bottom of the page, it's page 57)
if you follow question 2 and question 3, if you don't have the SS#, you aren't eligible for the stimulus. There is an exception for members of the US Armed forces when one of the spouses doesn't have an SS#.
https://www.irs.gov/pub/irs-dft/i1040gi--dft.pdf
