InvalidAccountOverride
Example
{
	"code": "InvalidAccountOverride",
	"target": "Unknown",
	"details": [
		{
			"code": "InvalidAccountOverride",
			"number": 1406,
			"message": "The AccountOverride format is not valid.",
			"description": "Please append the overriding AccountId to your TechnicalSupport UserName, separated with '%'.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/InvalidAccountOverride",
			"severity": "Error"
		}
	]
}
Explanation

Please append the overriding AccountId to your TechnicalSupport UserName, separated with ‘%’.