"code": "InvalidCountry",
	"target": "Unknown",
	"details": [
			"code": "InvalidCountry",
			"number": 125,
			"message": "The country or country issued '-0-' is not a recognized country code.",
			"description": "Please use the 'ListCountries API' to identify a list of ISO 3166 countries and codes.",
			"faultCode": "Client",
			"helpLink": "",
			"severity": "Error"

This indicates that the country code you provided is not recognized as a valid ISO 3166 country code. All Avalara country codes are two-character ISO 3166 codes. Please verify that the country/region combination you are specifying matches the ISO 3166 definitions.

For more information on the international standard for ISO 3166 country/region codes, please see the ISO webpage: or the Wikipedia article listing current codes: