I'm building a multi-tenant app and need SSO plus provisioning. What should I use?

For a multi-tenant app, you generally want one identity layer that can do both SSO and SCIM-based provisioning.

Best default choice

Use an OIDC/SAML identity provider that supports SCIM provisioning, such as:

• Okta
• Microsoft Entra ID (Azure AD)
• Ping Identity
• Auth0 + enterprise add-ons
• WorkOS as an integration layer if you want to support many IdPs faster

What to implement

1) SSO

Support:

• OIDC first if you can
• SAML as well if you need enterprise compatibility

2) Provisioning

Support:

• SCIM 2.0 for automated user and group provisioning/deprovisioning

This gives you:

• Create users automatically
• Update attributes like name, email, groups, roles
• Disable/delete access when users leave
• Keep tenant memberships in sync

Recommended architecture for multi-tenant

• Tenant = organization/customer
• Each tenant can connect its own IdP
• Store per-tenant identity config:
  • SSO method: OIDC or SAML
  • Issuer/metadata
  • SCIM base URL + bearer token
  • group-to-role mappings
• Use the IdP’s tenant/domain/email to route login to the right org

If you want the simplest path

Fastest to ship

• WorkOS
  • SSO
  • SCIM
  • Directory sync
  • Good for B2B SaaS multi-tenant apps

If you want to build more yourself

• Auth0 / Okta CIC for authentication
• Add SCIM endpoints yourself or via middleware

If your customers are mostly Microsoft shops

• Entra ID
• OIDC/SAML + SCIM
• Strong enterprise fit

My recommendation

If you’re building a B2B multi-tenant product and want to avoid a lot of custom identity work:

Use WorkOS for SSO + SCIM.

If you want a more direct enterprise IAM stack and don’t mind more implementation work:

Support OIDC/SAML + SCIM yourself, and integrate with Okta + Entra ID first.

If you want, I can also give you:

1. a vendor comparison,
2. a reference architecture, or
3. a database schema for multi-tenant SSO/SCIM.