Azure SAML Integration with Multitenant Support

The recent deprecation of the built-in Azure/Office365 authentication option has left us without a convenient way to allow users to sign in to our Zendesk using their Azure identities.

Currently there are two relevant tutorials on setting up SAML authentication in Zendesk, one from Zendesk and the other from Microsoft:
Enabling SAML single sign-on – Zendesk help
Tutorial: Azure AD SSO integration with Zendesk - Microsoft Entra | Microsoft Learn

Both of these tutorials, however, explain how to create an authentication option that works for a single tenant. In our case, the end users logging in to our Zendesk instance exist in their own Azure tenants.

Using the Zendesk application from the Azure marketplace we can edit the app registration to enable multitenant logins, but in practice it does not work.

Has anyone successfully setup SAML authentication between Zendesk and Azure that supports multitenant logins?