Problem

Jira Service Management creates duplicate tickets on email replies from customers.

Diagnosis

• The Jira Service Management email handler is Cc'd in a mail thread, along with other Service Management customers.

• Replies to the email thread create duplicate tickets in Service Management.

• Members of the mail thread are not "request participants" of the original request.

Causes

Service Management customers don't have permissions to share request with other people.

Resolution

In Jira Service Management, only the issue reporter, the request participants and members of the organization which the ticket is shared with, are the customers who can comment on the ticket. That said, make sure that customers have permissions to add other people to the request.

• Go to Service Management Project > Project settings > Customer permissions (or Service Management Project > Project settings > Channels > Customer permissions if it's a Next-gen project)

• Under Customer sharing, select the option Customers can search for other customers within their organizations, or manually enter the email address of other customers within their project or Customers can search for other customers within their project or organizations.