You can enable it via https://id.atlassian.com/manage/two-step-verification. This would only work for your account.
However, if you're referring to Atlassian Access 2FA which would affect all Atlassian Account associated with the verified domain, you would need to exclude all the accounts except yours, once it's enabled. It's a manual work and a bit tedious if you have a lot of accounts associated with the verified domain, but it would allow you to manage all accounts.
We have a guide on how to do both:
Hi Community! Thank you to all those who joined our What’s new in Atlassian Access webinar last week! We received so many great questions about existing functionality and newly released features of...
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