Final answer:
The claim that all Azure services in private preview require access through a separate Azure portal is false. After receiving access to private previews, users generally use the same Azure portal as for public Azure services.
Step-by-step explanation:
The statement that all Azure services in private preview must be accessed by using a separate Azure portal is false. Microsoft Azure offers a variety of services and features, some of which are available in public preview or private preview.
Private preview features are not generally available to the public and require an application and an approval from Microsoft to access. However, once granted access, users can typically use the same Azure portal they use for general Azure services, although there may be some features or services that require a special access method or additional setup within the portal itself.