Deploy separate Microsoft 365 instances for each tenant and establish traditional VPN connections for secure access, despite the increased complexity and cost.

Integrate a third-party identity and access management solution to centralize user identities and permissions across all tenants, potentially introducing compatibility and security risks.

Implement Microsoft Entra Internet Access with cross-tenant configurations to securely and efficiently provide access to Microsoft 365 services for users across all tenants.

Modify the existing network infrastructure to allow direct, unsecured access to Microsoft 365 services for all users, disregarding security best practices.