Can't find visible place via geocoder api

[webeht]

Hi, we are struggling get the geocoder api running for some places. One example is the village "Challacancha" in Peru that is clearly visible in the map. Request "https://api.mapbox.com/geocoding/v5/mapbox.places/Challacancha.json?access_token=pk.[...]&language=en&limit=10" gives no results. Running with larger cities is no problem...so what could be wrong here?
Thanks