Ok...Since you used the 2021 desktop editions, then all you need to do is start the 2021 program on your computer. Continue the 2021 tax return that you filed then follow the instructions in the Support FAQ for the Form 8962 either Windows or Mac - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-forms/got-12c-letter-irs-form-8962/L...
