After you file

This is 100% a data entry error by you the user ... look at the W-2 worksheets as suggested to see who the W-2's were assigned to ... they must have all been assigned to you  since you got the IRS notice.  And since you failed to read the warning screen similar to the screen shot I posted, then the accuracy guarantee will not cover the error.   And if you still want to discuss the issue then you need to contact TT support directly