This blog discusses securing cross-tenant access with a focus on preventing data exfiltration.
It’s impossible to imagine a successful modern organization that doesn’t collaborate with partners across organizational boundaries. While cross-company collaboration empowers employees and enables partnerships, it also lowers barriers for both accidental and malicious data exfiltration. Microsoft Cross-Tenant Access Settings is designed to address security of cross-company exchange.
Outbound and Inbound Cross-Tenant Access Settings offer fine grain security controls for cross-company collaboration using user’s home identity, while Tenant Restriction v2 (TRv2) can be used to prevent data exfiltration using foreign identity.