There are a number of blog posts with outdated instructions for setting up the Azure Service Bus to enable debugging for Remote Event Handlers. The old info is to go to the Azure Portal and create a Service Bus in the UI, or to run the following PowerShell command:
New-AzureSBNamespace -Name mynamespace -Location “East US” -CreateACSNamespace $true -NamespaceType Messaging
However, the UI does not generate a service bus with an ACS namespace (which is required for this task), and the above PowerShell command is deprecated and is not available.
As of the time of writing this, the following works fine:
New-AzureSBNamespace -Name ‘mynamespace’ -Location ‘East US’