In the Azure map spatial services in PostBuffer the response from the service contains a distances collection(see image) as can be seen in the example from the documents
example area . There is no indication at what size of unit is used in the response for example does the number represent metres, miles, yards etc.
Similar in the
GetBuffer area of the doc there is no indication of what the 'distances' represents in the get request-
GET https://atlas.microsoft.com/spatial/buffer/json?subscription-key=[subscription-key]&api-version=1.0&udid=[udid]&distances=176.3