Steve Jones is getting me in a ranting mood:
I kept editing the file and trying different things. I compared what I had locally with what was on GitHub. Eventually, I realized this is the issue:
{employeeID:row.EmployeeID}
In the GitHub csv, the first row has headers with EmployeeID. In my local file, the header is “employeeID” (lower case). As soon as I edited this, it worked.
Case sensitivity is a big historical mistake.