Why does TurboTax show my Federal Return has been accepted, but IRS.gov tracker shows received but not accepted yet?

Your return may be pending at the IRS.  Once IRS accepts your return, TurboTax does not receive any updates.  TurboTax does not issue refunds.  

Once your return has been accepted by the IRS, TurboTax is no longer involved in processing.  

All refund inquiries should be made to the IRS.  Where Is My Refund 

There could be a few reasons why you might be experiencing a delay;

1. First, the status might be pending for security reasons. This may be a sign that someone is trying to use your identity to file a tax return. The return has been placed on hold to allow you to cancel it if it doesn't belong to you. This can take up to 72 hours, after which your return will then be forwarded to the IRS, or if applicable, rejected. If rejected, you can then correct the rejection issue and resubmit. Please see this FAQ for reference.

2. The Path Act

The PATH Act stipulates that the IRS must withhold refunds for filers who claim these tax credits until February 15. So if you file before February 15, you're owed a tax refund and you're claiming either the ACTC or EITC, your entire refund will be withheld until at least the February 15 deadline.

There are several other reasons why your refund might be delayed.

Note: These instances may be applicable. That is, you could have a hold for security reasons first. And additionally for verification of the refundable credits in your return. In this case, delays might extend beyond 72 hours.