In the old days of using the Azure Machine Learning Workbench, it was easy to get the ML API Key from the portal, but currently (end of 2018) , with the retirement of the Workbench, there is no may to get the ML API key from the Azure portal. It needs to be called through the API to get that key.

I am starting a new Users Group for AI and Machine Learning in New York City and it will be hosted at the Microsoft Reactor in Grand Central Tech. Join us!