Yes, in most cases you can file an amendment for additional refund for three years from the original due date of the return. If you filed with TurboTax for 2020, there is no cost for the amendment software and you can follow the steps above for the 2020 return to be sure you were not penalized for excess HSA contributions.
This TurboTax Help article has step by step directions to amend your return. Amend 2020 return
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