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Since you filed the 2020 Return, you will need to amend your 2020 Tax Return to claim the 2nd Stimulus payment. You cannot claim the 2nd stimulus payment in your 2021 Tax Return since only the third stimulus payment can be claimed via the 2021 Tax Return.

Please refer to the image below taken from the IRS Instructions:

Please visit How do I amend my 2020 return? on further instructions on how to amend your 2020 Return.