No, you will not have to pay back any of the refunded money. There is a special provision in the American Rescue Plan Act regarding taxpayers who were on marketplace insurance and received unemployment at any time in 2021.
According to the IRS, "If you, or your spouse (if filing a joint return), received, or were approved to receive, unemployment compensation for any week beginning during 2021, the amount of your household income is considered to be no greater than 133% of the federal poverty line for your family size and you are considered to have met the household income requirements for eligibility for a premium tax credit."
The calculation of the Advanced Premium Tax Credit you received for payments to your marketplace insurance provider is reconciled against the tax credit you should have received as if your income for the year was 133% of the federal poverty line. If you are getting money back from that reconciliation, that is yours to keep and will be added to your 2021 return.
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