Create an administrator user - Amazon Account Management
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Create an administrator user

Because you can't restrict what a root user can do, we strongly recommend that you don't use your root user for any tasks that don't explicitly require the root user. Instead, assign administrative access to an administrative user in IAM Identity Center, and sign in as that administrative user to perform your daily administrative tasks.

For instructions, see Set up Amazon Web Services account access for an IAM Identity Center administrative user in the IAM Identity Center User Guide.