Can't add custom mailbox in service project
Platform Notice: Cloud - This article applies to Atlassian products on the cloud platform.
Summary
Learn why you get "Couldn’t add email address" when trying to connect a custom mailbox to your project.
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.