Is the IRS processing the Form 4547 that is eFiled with the tax return?

Form 8879-TA says the ERO must retain this signature page.

I am believing that the IRS is not processing the Form 4547 because there is no signature on the form and/or maybe the 8879-TA is not properly attached.  Clients seem to be getting an IRS letter that perhaps indicates that the form is not signed.  

Is this an IRS issue or an Intuit issue in correctly processing the eFiled Form 4547?