You can't change the domain name as per the Atlassian OnDemand Resctricted Functions. However, if you'd like to "change" the domain, I'd recommend you to sign up for a new account under Atlassian and create a new instance with the new name. Then, migrate your data from the old instance to the new one, and deactivate the old instance.
Hope it helps.
Hey Community mates! Claire here from the Software Product Marketing team. We all know software development changes rapidly, and it's often tough to keep up. But from our research, we've found the h...
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