A caveat before using the preview is to uninstall the current Azure Active Directory PowerShell module first. In addition, it's just available in 64-bit form. Azure PowerShell 1.0 Preview ...

The Microsoft Entra PowerShell module became available as a public preview this week; interested users can access it here. It can be used for managing Entra ID groups, users, policies and more.

Abuse of trust relationships and weak Azure AD configurations. Cross-tenant synchronization works by allowing a source tenant to sync users into a target tenant.