In 2018 I filed jointly with SSN + ITIN but both of us had an SSN during 2019. Somehow the SSN didn't get filed when I submitted our 2019 tax returns jointly. I even remember changing the SSN numbers, sadly.
Since the IRS local offices are closed for COVID-19, you can't convert the filed tax records in person. I just mailed off the paperwork to the IRS to switch the tax records. See "What do I do when I am assigned a social security number (SSN)?" at the link below:
https://www.irs.gov/individuals/additional-itin-information
Crossing my fingers we'll both get stimulus money since both of us get "Payment Status Not Available" when trying to use "Get My Payment" at the IRS now.
