I did some more searching and discovered where I needed to go within Turbotax to enter my IP PIN. It's in the "Other Tax Situations" tab then scroll down to the "Other Return Info" section then click on top item "Identify Protection PIN." Damnit this was not intuitive at all IMO! I was expecting to be asked for my IP PIN during the e-file process - NOT smack in the middle of entering all my other tax info!
