EIN for "non-entity" single member LLC

Back in 2015, I transferred ownership of my rental properties to a single member LLC.  I have no employees.  I got an EIN because initially I thought the LLC would file taxes separately from my personal taxes.  After consulting with an accountant back then, he told me the LLC is a "financial non-entity" and to continue filing as I always have with my SS# and TurboTax.  This year, TurboTax is asking me if the rentals are rented through an LLC and it wants the EIN.  Since the LLC is a "financial non-entity", how do I answer this question when I do have an EIN but it has not been used? 

Thank you.