AWS: Adding a new MFA device says “This entity already exists” or “MFA device already exists”

A team-member was trying to register a new MFA device in AWS, and was being told that they already had one registered:

However, their account claims that none are registered:

However, it looks like AWS might show an empty list when it shouldn’t when the user has started the process but was interrupted from completing it. Use the AWS CLI “list-virtual-mfa-devices” subcommand to enumerate the current MFA devices:

$ aws iam list-virtual-mfa-devices
{
    "VirtualMFADevices": [
        {
            "SerialNumber": "arn:aws:iam::326764833890:mfa/karan"
        },
        {
            "SerialNumber": "arn:aws:iam::326764833890:mfa/rachel"
        },
        {
            "SerialNumber": "arn:aws:iam::326764833890:mfa/sarah.benhart"

Now, remove the problematic one using the corresponding SerialNumber value:

$ aws iam delete-virtual-mfa-device --serial-number <SerialNumber value>

You will now be able to restart the process with them. Make sure to have them remove any existing entries in their app so they don’t get confused.

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