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Click on the hamburger menu (
) → Setup → App Flow Config ()
Click on the dropdown menu at the top right and select the Undelivered Reasons option.
Click on the Edit Undelivered Reason (
) icon on the right side of the table under the options column.
Edit Undelivered Reason option → A form shall appear with required fields to be edited.
Edit the form with the required changes and click on the Update Undelivered Reason button.
You’ve successfully edited an Undelivered Reason.