Playing with the demo for transationg, I stumbled over this:
I managed to set the service endpoint to api-eur.cognitive.microsofttranslator.com for which I have a valid api-key.
However, the property service region is by default set to westeurope, which shows up as:
But then the authorization fails. Without the Ocp-Apim-Subscription-Region: westeurope, the request succeeds.
I verified this using the RESTDebugger.
Is it possible to leave the serviceRegion empty without having it set to some default?