Microsoft introduced new secure default settings dubbed ‘Security Defaults’ to Azure Active Directory (Azure AD), now available for all license levels, including trial tenants. Microsoft says that it has already been enabled for over 60k newly created tenants, with another roughly 5k also having opted in. The new security feature is automatically enforced across the entire organization when toggled on, and they help protect both admins and users from common identity-related attacks such as password spray, replay, and phishing.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-enables-security-defaults-in-azure-active-directory/