Unable to create route matrix in Multi-Itinerary Optimization example

The error described below pertains to the official example of using Azure Maps for route planning, available at: https://samples.azuremaps.com/rest-services/mio

During the preprocessing phase of the Multi-Itinerary Optimization example, the following service is called: https://atlas.microsoft.com/route/matrix/json?api-version=1.0&waitForResults=true

Since approximately Tuesday, the service has been returning a status code 200, but JavaScript logs the following error message: "Uncaught (in promise) SyntaxError: Unexpected end of JSON input"

Could you please look into this issue? We are experiencing the same scenario with the same error behavior.