DeleteUserSelfError
Example
{
	"code": "DeleteUserSelfError",
	"target": "Unknown",
	"details": [
		{
			"code": "DeleteUserSelfError",
			"number": 22,
			"message": "Profile can't be deleted.",
			"description": "You can't delete your own profile. Contact your account administrator for help. -0-",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/DeleteUserSelfError",
			"severity": "Error"
		}
	]
}
Explanation

As a user who has successfully authenticated against AvaTax, you cannot call DELETE on your own user object. To delete this user, please use different account credentials.