You will need to 1) file the correct return for the EIN you didn't use (LP1) and 2) file an amended (or revised) return for the EIN (LP2) that has been accepted by the IRS.
The first step is very straightforward. Open TurboTax Business 2021 and create a new return using the correct EIN and other information for LP1. E-file this return no later than March 15, 2022.
It's possible the IRS will reject the return you have filed if the EIN doesn't match the other company information they have on file. Wait a few months to see if that happens. If so, revise this return (everything EXCEPT the EIN) and resubmit.
If and when you are certain the first return has been accepted and processed by the IRS, you can prepare an amended return for LP2. Open TurboTax Business 2021 chose Amend a Tax Return from the main screen. Choose the return you did file. Do not change the EIN, but update all other information for this company including activity for 2021.
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