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I completed my tax return for 2020 and filed it electronically but it was rejected.  They said someone else used my social security number to file a return.  I had received an alert emailed the day before and called the 800 number.  They said it would hold for 48 hours before the invalid return would be submitted.  I filed my return and it was rejected.  Now what do I do?  

This just happened this evening.