Why was my reservation canceled due to non-payment?

Your program fee wasn't received by its deadline (see “How and when do I pay for my Group Trip?” in the Payments & Deadlines section of the Help Center for how that deadline is set).

This happens automatically on the platform. What refund you're eligible for, if any, depends on your fare type and how much time has passed since your original purchase — see “What is the Group Trips cancellation and refund policy?” in the Cancellations & Refunds section.