Subject
Because Atlassian account names are based on user email addresses, it is not possible to change the email address on an account. However, you can move the existing licenses or OnDemand subscriptions to a new account with a new email address, or add new contacts to any existing licenses or OnDemand subscriptions
check this doc for more information
https://confluence.atlassian.com/pages/viewpage.action?pageId=321257577
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