I received the same message. Looks like the IRS won't accept a return unless a Waiver Explanation Statement is attached to Form 2210. The statement can be found by clicking on "QuickZoom to Waiver Explanation Statement" on Line 17 of Form 2210. I entered "85% Penalty Waiver" and resubmitted my returns. TurboTax informed me that my returns had been accepted within an hour or two.
