If you filed using the non-filers form, what you did behind the scenes was filed a simplified version of the 2019 tax return. When you are ready to file your actual 2019 tax return, you will need to file Form 1040X with all of the initial numbers being 0.
Many taxpayers are receiving the same notice as you, as the system is still being loaded with taxpayer data.
The IRS generally updates systems once daily, and these updates tend to occur in the overnight hours, so I would check again in a few days for an updated status.
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