The IRS believes that you (or a dependent listed on the tax return) should be reporting a form 1095-A Health Insurance Marketplace Statement on your tax return.
You may be able to find a 1095-A form by signing in to your healthcare.gov account and downloading it.
Perhaps the form has not yet been mailed out or was mailed to a different address.
This TurboTax Help may apply to your situation.
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