You can contribute to the HSA up until the due date of your tax return. No matter when you made the contributions, whether it was in 2021 or in 2022 up to the date that the return was due, enter the amount as though you had already made the contribution.
Then, when contacting your bank, ask them to classify the contributions as 2021 contributions.
[Edited 2/22/22 RobertB4444]
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