Problem Definition

Atlassian Cloud administrators are unable to change the email address for portal only customers.

This is sometimes necessary as customers may change their email or domain for different reasons.

Suggested Solution

Allow site-admins to perform this change.

Workaround

The only possible alternative would be to create new customer accounts using the new email addresses and manually add those accounts as the reporter or request participant in the active tickets that still need to be followed up.

How to change Jira Service Management customer email address