What this means: Jarvis found an existing enrolment with the same employee ID, but the NI number in this submission is different from what was previously recorded.
Why this might happen: The worker's NI number was changed in your payroll system, or the worker corrected it directly in Jarvis.
What to do
Confirm the correct NI number with the worker
If payroll is wrong: correct it and resubmit
If Jarvis is wrong: contact Jarvis Support to update the record, then resubmit