Yes, submit the letter, if you received the notice, Form 8962 and page 2 of Form 1040 to the IRS.
You can reply to the notice and not have to amend. You need to print out Form 8962 and submit it with page 2 of your Form 1040.
See this article for how to do this in TurboTax: The IRS is requesting Form 8962 for 2019
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