I ran into the same thing until I noticed the "county" in the instruction. You can keep the address, just remove BOTH parcel ID and county (change back to No Entry).
It's just a bug. TurboTax could have removed the county selection for us when we removed the parcel number, or, better yet, when asking us to type in address in the beginning, don't allow us to choose a county in the first place. Apparently in the system. parcel number and County go together, but the user interface design failed to support that.
