from what filing stats to what filing status are you changing. married taxpayers cannot change their filing status from joint to separate after the original due date
it could be either Turbotax or IRS blocking e-filing. if you can't e-file the Federal you can't e-file the state. there is nothing to be done except to mail it in. see Turobotax filing instructions. for just a change in filing status, no attachments would be required. if you owe send payment. the IRS will bill you for any penalties and interest. use a service where you can track that the IRS got it. be patient it could take the IRS 6 to 9 months maybe even longer to get to your return. during this period, no status will be available.
