Can't add custom mailbox in service project

Summary

Learn why you get "Couldn’t add email address" when trying to connect a custom mailbox to your project.

Solution

I'm an administrator. Why can't I connect a custom mailbox to my service project?

This error message indicates that you are a project administrator, but not a Jira administrator. You must be a Jira admin to connect a custom mailbox on a service project.

How can I fix this?

Reach out to your site admin so they grant you permission to Administer Jira. You can read more about this global permission here.