"code": "RetrieveUserError",
	"target": "Unknown",
	"details": [
			"code": "RetrieveUserError",
			"number": 161,
			"message": "Unable to retrieve Avalara user ID.",
			"description": "The account associated with this request is not authorized to make AvaTax API calls. Please contact your CAM and verify that you have a valid AvaTax subscription.",
			"faultCode": "Client",
			"helpLink": "",
			"severity": "Error"

This indicates that you attempted to call an API using an OAuth 2.0 bearer token, but this token does not correspond to a provisioned AvaTax user account.

Please contact your customer support representative and request an account.