CSV Meeting Registration does not import responses to custom registration questions

[ECP_SShap]

I have Zoom Pro and a license for Large Meetings. I have read through all of the supporting documentation provided for bulk uploading registrants to a meeting via CSV and am unable to make the following work.

The meeting is a single occurrence, and has an auto-generated ID.

Registration for the meeting requires the default fields: First Name, Last Name, and Email Address, plus two custom fields: Organization, and Job Title. I have created a CSV file without headers in the format: Email Address, First Name, Last Name [from Zoom template], Organization, Job Title.

When I upload a test file, the Organization and Job Title are not imported. I have checked the formatting (no special characters), tried to upload the Zoom upload template with text in columns D & E, CSV file is saved as CSV (Comma delimited) (*.csv), and I am using Google Chrome. All drivers and software versions are up-to-date. We have a list of 100+ attendees to bulk register. 

Any support would be much appreciated. Thank you.

Any