If you are married filing separately (MFS), you must both file using the standard deduction or the itemized deduction. One of you will need to change your deduction method. If your return doesn't get rejected by the IRS first, someone will have to amend his/her return.
Please read this TurboTax FAQ about amending your 2018 tax return: How to amend (change or correct)
a return you already filed.
