Most of the identity count was not theirs.
A pilot tenant enumerated 6,731 identities. After scoping to the identities the organization actually owns and is accountable for, the number was 1,150.
Why the gap exists
A Microsoft tenant contains a large population of first-party and platform-managed service principals — identities Microsoft provisions and controls, not ones the customer created or can govern. They are real identities. They are not the customer's attack surface.
Why it matters commercially
A vendor priced per identity, or one reporting a headline count, has a direct incentive not to make this distinction. Reporting 6,731 is more impressive and less true. It also buries the 1,150 that someone actually has to do something about.
This is why AuditGraph is priced per subscription rather than per identity, and why platform-managed identities are excluded from customer-facing counts by default rather than as an option someone has to find.