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Assuming this is a stand-alone account and not a member account of an AWS Organization, then if in addition to having access to the root email, you're able to receive phone calls made to the phone number of the account's primary contact, you can remove the MFA device from the root user by following the instructions here: https://aws.amazon.com/blogs/security/reset-your-aws-root-accounts-lost-mfa-device-faster-by-using-the-aws-management-console/
If the registered phone number is not accessible, such as if it's controlled by the former developer who went unresponsive, the only way is to work with AWS support to validate your title to the account and for them to restore access for you, which I understand is exactly what you're attempting.
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Why is your production down because of lack of MFA to the root login? This doesn't track on best practices or validity.
Honesty I have no background in AWS setup three weeks ago, and hade to figure out all things like root email user, this MFA and other stuff, only the higher ups talk to the developer so when the dev went rouge and production went down, I was force to think outside the box, once if root user access is gain, will figure it out systematically how to up the production.