EngagementQuality.GetScoresAsync: The response does not contain a field called 'result'

[Jericho]

Sometimes the SendGrid API returns the following response when requesting engagement scores:

HTTP/1.1 202 Accepted
{"message":"We are processing the score for this date range. Please try again later."}

According to documentation, HTTP202 in this context means:

This operation returns a 202 response when SendGrid does not yet have scores available for the specified date range. Scores are calculated asynchronously from requests to this endpoint. This means a score may be available for the specified date at a later time, but a score is not available at the time of your API request.