I'm trying to "import" to update some phone numbers.   For most people, all works well.   But for some (~50), we get an error:

    registered_address.county can't be blank when signup county file id present


It's true that those records did already have a county_file_id and have no county name.   So I tried to set one - in all three fields, Registered address / county, Mailing address / county, and Primary address / county.  The latest attempt is here:

    https://carolammonsforstaterep.nationbuilder.com/admin/imports/161/download


But no matter what I do, whether I re-set the registered address/state along with county, whether I set the county_file_id to what it is already set to or leave it un-uploaded, I get this error.

I could make a list of the relevant people and use batch update.   But I don't understand why this isn't working, and wonder if I'm missing something important.