Two-Factor Authentication (also known as 2FA), allows you to add another layer of verification to the login process, requiring a second piece of information in addition to your email address and password in order to log in to Trello. The purpose of 2FA is to make it more difficult for an attacker to gain control of your account by requiring a code that is only accessible via a second authentication device.
You can add 2FA through your Atlassian Account. Configure 2FA following the steps here: Manage two-step verification for your Atlassian Account
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