I filed my 2021 return and it has been processed by the IRS, but I received a corrected 1099-DIV on April 21 (d'oh!), so I need to file a 1040-X. I stepped through the process, which at the end says to mail my return or click File to e-file. So clicked File, stepped through the e-file process, and when I click Transmit Returns Now, it finishes Reviewing and Preparing, but when it hits Validating, it fails with a reason of "cancelled / Looks like we've had a technical hiccup." What now?
