I've been using the HERE v8 isoline for a few months without problems but now the departureTime seems to have no effect anymore. Changing the date, time, removing it completely or setting it as "any" seems to return the same polygon.
below is an example call, just add your apiKey at the end to test and then play with the departureTime to see what I mean.
https://isoline.router.hereapi.com/v8/isolines?transportMode=car&origin=52.51578,13.37749&departureTime=2020-05-10T09:30:00&range[type]=time&range[values]=300
Does anyone have any ideas?
Cheers