Publishing a Copilot Studio agent creates an Entra identity in the same minute. As of March 18, 2026, every Copilot Studio agent in a default-on tenant gets a Microsoft Entra Agent ID: a service principal with the 'Agent' subtype, governable through the same Entra admin center and Microsoft 365 admin center your IAM team already operates. A walkthrough of what the Agent ID is, how Agent 365 governs it, the connected dual-agent pattern from a defensive SecOps PoC, and a 7-step