Microsoft has set a clear deadline for organisations still operating Microsoft Sentinel in the Azure portal. The technical connection to the Defender portal is important, but the larger risk is assuming that a successfully connected workspace means the SOC is operationally ready.
Microsoft states that after this date Sentinel will no longer be supported in the Azure portal and will be available only in the Microsoft Defender portal. Existing users should plan the transition now rather than treat the deadline as a last-minute interface change.
This guide is for CISOs, heads of security operations, SOC managers and platform owners who need a defensible answer to one question: will our people, processes and automation still work when the operating experience moves?
Why this is an operating-model change
The Defender portal brings Sentinel and Defender XDR into a unified experience. That can reduce tool switching and join investigation workflows, but it also changes where analysts work, how permissions are understood and how incidents and automations behave.
Microsoft’s transition guidance calls out differences in data policies, feature locations, incident correlation, automation behaviour and multi-workspace configurations. A sensible programme therefore tests the end-to-end service: technology, access, queues, integrations, procedures, evidence and team confidence.
Seven readiness checks
Confirm ownership and workspace scope
List every Sentinel-enabled Log Analytics workspace, its subscription, business owner, technical owner and operational purpose. Decide which workspace is primary and document the intended treatment of secondary workspaces. Multi-workspace environments deserve explicit testing because the Defender portal distinguishes between a primary workspace and connected secondary workspaces.
Map access before changing the analyst experience
Record the Azure and Microsoft Entra roles used by analysts, engineers, responders, automation identities and support teams. Then test real tasks using representative accounts. Do not stop at successful portal access: confirm that each role can see the right incidents, query the expected data, manage content where authorised and invoke the actions its runbooks require.
Validate incident creation, correlation and ownership
Run controlled test alerts through the full path. Check how they are grouped, named, assigned and escalated in the Defender portal. Review automation rules that depend on incident titles or provider fields; Microsoft specifically warns that incident naming and provider behaviour can change after onboarding.
Test automation and playbooks as workflows
Inventory automation rules, Logic Apps, credentials, API connections and dependencies. Verify the trigger, expected data, execution order, owner and failure route for each material playbook. Microsoft documents timing, batching and manual-run differences in the Defender portal, so a green Logic App alone is not sufficient evidence that the response process still works.
Exercise integrations and downstream records
Test ticketing, paging, chat, case-management, enrichment and reporting integrations. Compare the fields received before and after onboarding, including descriptions, identifiers, severity, owner and timestamps. Confirm that failures create a visible operational alert rather than disappearing into an integration log.
Rehearse the analyst day
Give analysts realistic investigation and response scenarios in the Defender portal. Observe navigation, queries, evidence capture, escalation and handover. Update runbooks and training around the workflow people will actually use; a technically correct migration can still reduce response quality if the team is learning during a live incident.
Define evidence, acceptance and recovery
Agree what proves readiness: test coverage, successful scenarios, accepted limitations, named owners and sign-off criteria. Keep a decision log and a prioritised defect list. Document the support and recovery route for material failures, even where the portal transition itself is not treated as a traditional application cutover.
A leadership-ready checklist
- Every Sentinel workspace has an owner, purpose and documented target state.
- The primary workspace decision is recorded and multi-workspace consequences are understood.
- Representative analysts and engineers have tested task-level access.
- Priority incident, correlation and escalation scenarios have passed.
- Material automation rules and playbooks have named owners and tested failure paths.
- Ticketing, paging and reporting integrations have been validated end to end.
- Runbooks and training reflect the Defender portal workflow.
- Known limitations are risk-owned rather than hidden in a technical backlog.
- Operational acceptance criteria and executive reporting are agreed.
A practical 30-day readiness plan
Week 1: establish the baseline
Inventory workspaces, roles, analytics, automation, integrations and operational dependencies. Identify the incident types and playbooks that matter most rather than attempting to test everything with equal depth.
Week 2: validate in the Defender portal
Connect or use the agreed test scope, then run representative tasks and controlled scenarios. Capture differences in permissions, incidents, automation, data access and integrations as evidence—not anecdotes.
Week 3: remediate the operating gaps
Correct role assignments, fragile conditions, obsolete automation patterns, missing runbook steps and failed integrations. Assign a risk owner and due date where a limitation cannot be removed immediately.
Week 4: rehearse and accept
Run an analyst exercise, repeat the material technical tests and present a concise readiness view to security leadership. The output should show what works, what remains at risk, who owns it and what happens next.
Questions a CISO or SOC leader should ask
- Which workflows would fail or slow down if we had to use the Defender portal tomorrow?
- Can we prove that every priority playbook receives the fields and trigger behaviour it expects?
- Have permissions been tested by real job role, rather than inferred from a design?
- Which integration failure would create the greatest response delay?
- What evidence will we use to accept the new operating experience?
- Who owns the remaining risk before 31 March 2027?
When outside help is useful
External support is most useful when the technical migration is entangled with an overloaded SOC, unclear ownership, fragile automation or a wider Sentinel cost and detection programme. A short assessment should leave the organisation with an evidence-based baseline, corrected priority issues and a plan the operating team can own.
See how Skraba approaches Microsoft Sentinel consulting, or book a short clarity call to discuss the current environment.
Official Microsoft sources
Product guidance changes. The links below were checked on 23 September 2026; confirm the current Microsoft documentation before making production changes.