The TurboTax the instructions that you should be following are in the FAQ at the link below. At the bottom of the FAQ click the link for the type of TurboTax software that you are using. Note that the FAQ says "You don't need to complete or send a Form 1040X (amended tax return) to the IRS."

https://ttlc.intuit.com/questions/4348755-the-irs-is-requesting-form-8962-for-2018

You should also read the information at the following link on the IRS web site.

https://www.irs.gov/individuals/understanding-your-letter-0012c