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Sign in to your AWS Root Account
Open the AWS Console and click on Sign in. Figure 1: AWS Console login page.
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Enter your root user email address
This should be the same email used to create the AWS account. Figure 2: Root account email entry.
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Go to your Security Credentials
Once logged in, click your account name (furthest top right) → Security Credentials. Figure 3: Navigating to Security Credentials.
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Assign MFA Device
In the Multi-factor authentication (MFA) section, click Assign MFA device.
Choose your preferred method (Authenticator App, FIDO2 key, etc.), and follow the on-screen prompts. Figure 4: Assigning an MFA device.