Microsoft Defender for Cloud Apps in GCC High gives security teams discovery, control, and monitoring for third-party SaaS that affects CUI programs, with government cloud specifics and documented App Governance gaps.
A service provider enters your CMMC scope once its systems process, store, or transmit CUI or Security Protection Data for you, which triggers documentation, shared responsibility, and assessment requirements that you control and must evidence.
FedRAMP authorization or equivalency for a cloud service does not create CMMC reciprocity for a contractor, but the FedRAMP body of evidence can support CMMC Level 2 assessments when you scope it and map it to NIST SP 800-171 objectives.
CMMC Level 2 expects you to define the CUI system boundary and enforce it with managed interfaces at external and key internal network points across on-premises and cloud environments.
Microsoft prices and packages GCC High differently from commercial tenants, and those differences drive spend, capability, and timing decisions for DIB organizations that handle CUI and export-controlled data.