Error message API key is not valid for this application on my smartphone

Hi, I have installed a Graphhopper server on my laptop. I would like to connect my smartphone Android to my laptop and display the map I see on my laptop. When I connect my smartphone I get the error message “API key is not valid for this application” and there’s no map.
What shall I do in order to get the map freely on my smartphone?
Thanks for the help.

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