Microsoft’s Real‑time event registration uses unmapped fields (custom registration fields), but there is no built‑in export that produces a clean Excel file with one column per field.

Instead, all custom values are stored inside Form Submissions / Field Submissions, not in a flattened, event-centric table.

Outbound Marketing did support custom registration fields with a proper view and export, but that feature is explicitly listed as Outbound‑only and not available in Real‑time.

and we want bring it back to RTM!!!