Deploy separate instances of Microsoft 365 in each cloud environment and establish traditional VPN connections for secure access, ensuring isolation but potentially increasing complexity and cost.

Integrate a third-party identity and access management solution to centralize user identities and permissions across all cloud environments, which may introduce compatibility and security concerns.

Implement Microsoft Entra Internet Access with cross-tenant configurations to provide a unified, secure access solution for Microsoft 365 services across all cloud environments, leveraging Microsoft's native security features.

Allow direct access to Microsoft 365 services through the organization's existing network without implementing additional security measures, prioritizing ease of access over security.