BearerTokenParseUserIdError
Example
{
	"code": "BearerTokenParseUserIdError",
	"target": "Unknown",
	"details": [
		{
			"code": "BearerTokenParseUserIdError",
			"number": 160,
			"message": "Unable to parse Avalara user ID.",
			"description": "The Avalara User ID could not be parsed during Avalara Identity validation.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/BearerTokenParseUserIdError",
			"severity": "Error"
		}
	]
}
Explanation

You have obtained an OAuth token from Avalara Identity, but it did not represent a user with an AvaTax account. This can occur if you have created a token using a different service or process that is not compatible with AvaTax. In the terminology of OAuth 2.0, you have a token that lacks the correct scope and claims to be used with AvaTax.