It's not possible to build a map matching request with timestamps, because the builder uses commas to delimit the timestamps.

Expected Behavior

A Map Matching Request with timestamps will return a valid response

Current Behavior

The request fails because the API believes not enough timestamps have been provided

Possible Solution

Simply change the delimiter in com.mapbox.api.matching.v5.MapboxMapMatching$Builder.build() to ";" for timestamps. The same issue applies to the radiuses.

Steps to Reproduce

To reproduce, simply create a Map Matching Request and provide timestamps. When building, it will use commas instead of semi colons. It will appear to build correctly and send the request.