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HTTP status409 Conflict
Error codenotification_email_in_use
Resolve actionedit_monitor_notifications

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What happened

You tried to delete a notification email that is still listed as a delivery target on one or more monitors in the organization. The system refuses to remove it so monitors don’t silently stop delivering.

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How to fix

Monitors are project-scoped, not org-scoped, so locating every monitor that references the email is a two-step traversal: list the org’s projects, then list monitors per project.
1
List the projects in the organization: GET /v1/organizations/{orgId}/projects.
2
For each project, list its monitors: GET /v1/projects/{projectId}/monitors. Inspect each monitor’s notifications array for the email you’re deleting.
3
For each monitor that references the email, PATCH /v1/monitors/{id} with a new notifications payload that omits it.
4
Retry DELETE /v1/notification-emails/{id}.
Or open the organization’s monitor list in the platform UI at {baseURL}/organizations/{orgId}/monitors and remove the email from each affected monitor there.