The problem that occurred with your 2018 or 2019 return that made you ineligible for the stimulus in 2020 can be resolved on your 2020 return. The stimulus people received in 2020 was an ADVANCE for a credit that you can still receive when you file a CORRECT 2020 tax return in 2021.
https://www.irs.gov/newsroom/economic-impact-payment-information-center-topic-j-reconciling-on-your-...
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