MissingSubscriptionRegistration The subscription is not registered to use namespace
Edit
MissingSubscriptionRegistration: The subscription is not registered to use namespace 'Microsoft.CognitiveServices'. See https://aka.ms/rps-not-found for how to register subscriptions. I get this message when I signed on to luis.ai for the first time & tried to register an authoring resource.
Solution
In Azure Portal: Subscriptions -> {my subscription} -> Resource providers -> Microsoft.CognitiveServices -> Register.
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Once you do this. you can go to luis.ai and start using luis.