What can I do? I under paid my Q1 estimated tax. TurboTax flags it as an error and generated form 2210 . IRS will not take the electronic filing.

Please clarify the exact error message you are seeing in TurboTax. If you have an underpayment penalty, you will need to file Form 2210.

Have you run Review again recently? Many forms were released for e-filing in the last week.