The 1444 was a letter that was sent out a few weeks after your stimulus payment. It is not a form that you have to submit with your 2020 tax return. On your 2020 return you will be asked if you received stimulus money in 2020. Just answer the question and the software will reconcile the amount if you did not get the amount you should have received already.
The stimulus check is an advance on a credit you can receive on your 2020 tax return. If something went wrong or you did not get the stimulus check this year, you can get it when you file your 2020 return in early 2021—if you are eligible.It will end up on line 30 of your 2020 Form 1040.
https://www.irs.gov/newsroom/economic-impact-payment-information-center-topic-j-reconciling-on-your-...
https://www.irs.gov/coronavirus/coronavirus-tax-relief-and-economic-impact-payments-for-individuals-...
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