We've been using this API for a few months for reverse geocoding but in the last few days it has started returning a 404 error to all requests.
https://developers.arcgis.com/documentation/mapping-apis-and-services/geocoding/reverse-geocoding/
There is no sign of outages in the status pages and I have no idea who/where to ask about it. But from all my testing it seems to have died.
