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Policy-scope prerequisite inspection matters after registration, but cannot make a completely unmanaged on-premises server visible to Azure Policy.

Defender workload extensions can be enabled later; they do not replace the Arc resource onboarding step needed for policy targeting.

Arc connectivity troubleshooting applies once the Connected Machine agent is installed; this server has not yet been onboarded.

Guest Configuration policy prerequisites govern assessment after Arc is connected, not the underlying missing heartbeat.

Reinstalling an inventory interface would not repair the agent’s outbound TLS, DNS or proxy path.

Adding a Defender extension cannot restore connectivity if the Arc Connected Machine agent cannot reach its required Azure endpoints.

Endpoint threat protection is separate from the Azure Policy machine configuration extension, so enabling EDR does not deploy the guest policy.

Renaming Arc tags cannot satisfy missing guest policy extension/principal prerequisites or assignment scope.

Network troubleshooting is indicated when the agent is disconnected, not when the resource is connected but lacks guest configuration coverage.

Connectivity repair is unnecessary where Arc is already reporting Connected and the missing layer is paid threat protection.

An Arc Connected status confirms a cloud-management link, not that a paid Defender plan or the EDR sensor is deployed and healthy.

Machine Configuration policies audit operating system settings, not automatically enable every Defender workload protection plan.

Forcing EDR reinstallation before checking plan and VM eligibility can create churn without ever enrolling the resource in the correct scope.

Azure Arc prerequisites apply to off-Azure/hybrid resources, not an ordinary Azure-native VM already represented in Azure.

Comparing Plan 1/2 feature entitlements matters after proving this VM is actually in the enabled resource scope.

EDR sensor debugging occurs after the chosen plan and hybrid host onboarding are established.

Checking a plan on an existing Azure VM is not sufficient for a new unregistered Linux host outside Azure.

An arbitrary local scanner does not create an Arc Azure resource or entitle the host to Defender for Servers cloud protection.

Plan feature matching clarifies entitlements but cannot replace diagnosis of a missing endpoint sensor feed during a real event.

Subscription-level Defender plan selection does not guarantee endpoint integration or healthy telemetry for each protected machine.

Arc onboarding is necessary for some hybrid hosts; it does not explain a native VM’s missing Defender for Endpoint sensor events.

Machine support checks are necessary for coverage, but alone do not identify which extra features are included in each paid plan.

Plan 1 focuses on EDR and cannot be asserted to include all Plan 2 agentless and advanced capabilities.

Checking one endpoint sensor diagnoses a device, not the plan-wide discrepancy across multiple P1 and P2 capabilities.

EDR health helps detect attempts but cannot replace appropriate immediate network/permission compensating controls.

Scan freshness checks are useful if a finding is uncertain; here the severe vulnerability is already confirmed.

Correcting a base image prevents recurrence after redeployment but cannot immediately mitigate this known internet-facing production exposure.

Patch prioritization concerns vulnerability treatment, not whether EDR sensors have been deployed and are reporting.

Rebuilding a vulnerable image changes software, not EDR event-ingestion health across the fleet.

Plan enablement at subscription level alone cannot prove every machine’s endpoint sensor is active and telemetry is flowing.

Runtime threat telemetry is a different detection signal; a healthy EDR sensor does not prove that vulnerability packages were recently reassessed.

Exposure-aware prioritization and compensating controls are remediation planning, not evidence that the latest vulnerability scan is current.

Updating an image template without deploying to this running VM or fixing scanning coverage leaves the current assessment stale.