If you have contacted the IRS and they stated that your review will take 60 days then you will need to wait for them to provide you with additional information. TurboTax does not have additional information to provide to you unfortunately.
The IRS has indicated the 4464C letters are part of the screening program to combat stolen identity refund fraud and do not mean the taxpayer has been selected for audit. Both the IRS and the Department of Justice DOJ Tax Division have increased their efforts to combat stolen identity refund fraud.
**Mark the post that answers your question by clicking on "Mark as Best Answer"