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When changing the Bitbucket username, the user will be redirected to a login page.
The login page will then have the new username populated on it.
Attempting to login afterwards will show the error "You can no longer log in with a username. Use your Atlassian account email address (******@******.com) instead."
In this case, the logical behavior should be having the login page automatically populated with the user's email address instead of the username.