Fix missing or incorrectly mapped guest data
Check that the file has the expected header row and that the selected worksheet contains the guests.
Before importing
Check that the file has the expected header row and that the selected worksheet contains the guests. Review Map columns, including event selection, required fields and duplicate source-column mappings.
After a partial import
Read the summary and inspect the guest list before retrying. Filter to the intended event and clear search filters. Correct failed rows rather than importing the whole original file again. A network error can occur after a row was saved.
Undo and escalation
Use batch undo only if it is available, and review changed-record warnings. If data is still missing, contact support with the file type, mapping names and affected row numbers. Use a synthetic sample rather than emailing the entire guest list.