The Form 8962, Premium Tax Credit will be included with the 2019 tax return that was filed, IF and only IF you entered the Form 1095-A in the TurboTax program before filing.
You will have to amend the 2019 tax return for the Form 8962 and Form 1095-A as requested by the IRS for tax year 2019.
See this TurboTax support FAQ for amending a 2019 tax return originally completed and filed using the TurboTax online editions - https://ttlc.intuit.com/community/tax-topics/help/how-do-i-amend-my-2018-turbotax-online-return/01/9...
