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@Karl-M wrote:

So...you're saying that if the status is 'Sent to IRS' and you have a submission ID, that the schema failure is the issue.

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Thats my guess....they dont show us how the sausage is made though  LOL   

My "lack of an actual  crystal ball" prediction will be once they correct the issue,  those returns stuck as Sent to IRS will get formally rejected and have to be resubmitted.