Change user's email domain from account

Using the User Management API is there a way to change the domain name from someone's email? I tried an update via the API and I received the following error:

{
    "completed": 0,
    "notCompleted": 1,
    "completedInTestMode": 0,
    "result": "error",
    "errors": [
        {
            "index": 0,
            "step": 0,
            "message": "Old and new email address must be in the same domain.",
            "errorCode": "error.user.change_domain_update.no",
            "user": "testuser@currentdomain.com"
        }
    ]
}

ideas?