URL convention for requesting local isochrone for public transit

Hi there,

I have created my own local instance of Graphhopper following the following instructions here: graphhopper/README.md at master · graphhopper/graphhopper · GitHub
I’m looking to create a local instance of Graphhopper that returns a Json of isochrone coordinates for public transport travel time.
I’ve had the above working for routing, but unable to use the convention set out in the API documentation for Isochrones with this local install - I’d have expected something along the lines of https://localhost:8989/isochrone?point=51.131108,12.414551
to return a Json/XML/something - but no joy - just an error 400

I’ve been unable to find anything in the docs - so any suggestions would be much appreciated.

thanks a lot,

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