Your post is pretty short---so best guess----you thought you were preparing a 2019 return but used the current online software?
The online software is ONLY for 2020 returns and cannot be used for any other year. If you e-filed that return and it has been accepted, you have made a big mistake and will have a problem that will take quite awhile to fix.
Tell us if the e-file was accepted---use the e-file lookup tool. If the return was rejected---that is good news and the problem will be easier to fix.
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