Hello, We are flying JL 3 - JFK-HND-SGN

trying to check-in online and I'm being asked for VISA information. I've entered my Vietnam visa info and its telling me "ERROR: Web Check-in not completed". I've searched the web and am unable to find a answer.

Is this a known issue, are we forced to see someone at the check-in counter in JFK? Any chance we can use the kiosk to get a boarding pass allowing us pass security? Our positioning flight on DL has us in JFK 6 hours before our flight and counters don't open until 3 hours before departure Leaving us 3 hours waiting for the counter to open.

Any help from the masses would be greatly appreciated!!!