You can do it through GraphQL, I think the UI is just missing it. Here's a GraphQL example for reference: mutation { update_action( input: {action_id: "5274761b-fd26-45d2-950f-21bb48e1212x", config: {email_notification: {to_emails: ["test@test.com"], subject: "Prefect flow {flow_name} failed"}}} ) { success } }