SaaS single sign-on requires more than a successful identity-provider login. Define tenant setup, account matching, role assignment, deprovisioning and recovery when identity services are unavailable. Authentication establishes an identity under the configured trust; it does not automatically determine every permission inside the product.
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Identify the customer identity model
Ask whether users belong to one organisation, several workspaces or a mix of customer and personal accounts. Record how the correct tenant and identity provider are selected. Do not infer organisation membership solely from a typed email domain without an approved verification design.
Have the security owner choose supported protocols, trust configuration and assurance requirements. Verify current provider documentation for the actual integration rather than treating this buyer checklist as a protocol implementation guide.
Build a readiness checklist
| Area | Question | Acceptance scenario |
|---|---|---|
| Tenant setup | Who can configure the trusted provider? | Unauthorised configuration rejected |
| Matching | How are existing accounts linked? | Similar or changed email does not merge incorrectly |
| Roles | Which authority grants product access? | Valid identity without required role |
| New user | Is creation automatic or approved? | Uninvited identity follows the intended rule |
| Removal | How does access end? | Removed user and existing session tested |
| Recovery | Who can restore access safely? | Provider outage or misconfiguration |
| Audit | Which configuration and access events matter? | Responsible actor can be traced |
Agree provisioning separately from login. A product may authenticate through one mechanism while membership and roles are managed through another.
Plan customer onboarding and support
Use a test tenant and designated customer administrator to validate configuration. Provide clear diagnostics that do not expose secrets or assertion contents unnecessarily.
For a hypothetical enterprise customer, a mistaken mapping can remove access from every user. Define a controlled recovery process with verified authority. Avoid an undocumented universal bypass account that becomes a permanent security weakness.
Test changed and expired identity context
Include role changes, account disablement, workspace switching and expired sessions. Check direct record links and exports after access is removed.
Document session behaviour with the responsible security owner. Signing out of the product, signing out of the identity provider and disabling a user can have different effects depending on the design.
SSO questions
Does SSO remove the need for product permissions?
No. Define what the authenticated identity may do inside each tenant and record scope.
Can we add enterprise SSO after launch?
Yes, but account matching and tenant assumptions can create migration work. Consider expected enterprise requirements early.
Use the multi-tenant SaaS requirements guide, and discuss customer identity scenarios with Drema's SaaS team.
