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The password for the Administrator account can't be retrieved or reset. Be sure to keep this password somewhere safe.
You may notice an additional security group appear in your EC2 console. This group is necessary for the directory controllers (although you won't see these appear as EC2 instances in your console).
The directory will contain an account with the prefix AWSAdminD-. This account is necessary for AWS to perform maintenance tasks such as backup and FSMO role transfers. Removing this account or changing its password is almost certainly a bad idea.

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