If you have tax forms that needed to be reported on your tax return, and you forgot to report those forms, you will need to file and amended return and add those documents.
Please wait until the original return you file has processed. It is always possible that the IRS will catch your error and correct the return for you. (If that happens, they will send you a letter asking if you agree to their computations)
**Mark the post that answers your question by clicking on "Mark as Best Answer"
Chances are your whole return was not accepted.
This is from the IRA Website
"WASHINGTON ― The Internal Revenue Service announced that the nation's tax season will start on Friday, February 12, 2021, when the tax agency will begin accepting and processing 2020 tax year returns."