https://www.bleepingcomputer.com/news/security/microsoft-invites-researchers-to-hack-their-azure-security-lab/

Microsoft launched today the Azure Security Lab, a sandbox-like environment designed to enable security professionals to test Azure security without actually endangering the company's customers.

More to the point, the Azure Security Labs environment makes it possible for security researchers to more aggressively test for potential flaws in Microsoft's Azure cloud computing platform.