"code": "MedicalExciseError",
	"target": "Unknown",
	"details": [
			"code": "MedicalExciseError",
			"number": 131,
			"message": "TaxTypeId must be E (Excise) and RateTypeId must be M (Medical) for US country level rules (JurisTypeId CNT and JurisCode US).",
			"description": "-0- -1- -2- -3- -4- -5- -6-",
			"faultCode": "Client",
			"helpLink": "",
			"severity": "Error"

This indicates that you attempted to create a tax rule that designated a device as medical excise tax for an incorrect jurisdiction. In the United States, Medical Device Excise taxes are authorized by the IRS based on laws related to the medical device excise tax law:

When you create a tax rule, that tax rule must be designated as a country-level tax rule for the jurisdiction type CNT and use the ISO 3166 country code US.