Activate Defender for Identity sensor v3 only after its prerequisite checks

Use this document to resolve one bounded operational decision: Activate Defender for Identity sensor v3 only after its prerequisite checks. Only the official source and traced locations below supply facts. Confirm applicability before acting.

Source fact:

The official Deploy the Defender for Identity sensor v3.x from Microsoft supports the following bounded statements:

• The sensor v3.x is deployed on supported domain controllers. The research record locates this support at Opening overview.
• Microsoft directs administrators to complete prerequisite checks before activation and configure auditing and identity settings afterward. The research record locates this support at Opening overview.

The source support ends with the statements listed above. Use them to examine Defender for Identity workspaces, sensors, directory-service accounts, action accounts, network paths, roles, and deployment health in the applicable environment, not to imply a wider guarantee.

What the source does not establish

This is the v3 deployment sequence, not an eligibility inventory or validation result for any particular domain controller. It does not establish a deployment’s current state, authorize a production change, prove compliance, or show that Active Directory, Windows DNS, time, certificates, domain-controller resources, network capture, cloud connectivity, and security operations are healthy. Documented options are review inputs, not universal mandates.

Applicability questions

• For source statement 1 at Opening overview, which observable configuration, record, or test can confirm applicability here?
• For source statement 2 at Opening overview, which observable configuration, record, or test can confirm applicability here?
• Which deployed instance of Defender for Identity workspaces, sensors, directory-service accounts, action accounts, network paths, roles, and deployment health will be compared with the source, and why that instance?
• How will the review distinguish a source mismatch from a failure in Active Directory, Windows DNS, time, certificates, domain-controller resources, network capture, cloud connectivity, and security operations?
• Who approves the conclusion, exception, test window, and rollback threshold?

DSE recommendation:

DSE recommends using the cited source as the evidence anchor for this decision. Make the source, asset scope, owner, and expected outcome explicit in the review record. Record the source location, examined part of Defender for Identity workspaces, sensors, directory-service accounts, action accounts, network paths, roles, and deployment health, observed and expected states, owner, and reason for deviation.

For an approved change, define prerequisites, a limited test path, success and stop conditions, monitoring, and rollback. Check Active Directory, Windows DNS, time, certificates, domain-controller resources, network capture, cloud connectivity, and security operations in design order. Protect credentials, keys, recovery material, personal data, and sensitive topology in evidence.

Verification and evidence

Evidence should let another reviewer reproduce this decision. Retain observations beside the traced locations Opening overview; Opening overview. Favor sensor inventory, service and action-account permissions, health alerts, connectivity tests, portal state, and controlled detection tests, linked to stable identifiers, time, and operator.

Keep before-state evidence, approval, test or change result, exceptions, and after-state evidence together. Use an approved lab, window, or nonproduction path for risky tests. Set a recheck trigger for version, architecture, dependency, vendor, incident, or ownership change. A check proves only what was observed.

Official references

• Deploy the Defender for Identity sensor v3.x — Microsoft