Did you by chance use the non filer portal to register for the stimulus payment. If you did, a tax return with 0 income was efiled for you in order to register you. The non filer portal was for use only by persons who do not file a tax return.
If that is what you did, you will now have to either prepare and mail an amended return form 1040X or some are suggesting that you can just print and mail your "real" 1040 tax return and write "Amended Return" across the top of it. It must be printed and mailed by you. See the filing instructions for what to include and where to mail it.
