I have this information, it was sent to me when I set up to E-File, our Quarterly reports. When to IRS sends you, your 4 digit pin (I currently use this to make my employer tax payments) right below that is an Enrollment number that is 18 numbers long, 10 of that is supposed to be our 10 digit pin for E-Filing tax forms, from what I was to understand. I used to be able to E-File our Tax forms, now I cannot? When I go to send my 941 E-File it ask for my 10 digit pin, that I received from the IRS (EFTPS) I don't know what 10 numbers need to be entered into QB off of that letter? 

Your help is greatly appreciated.