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SAML SSO with Entra ID

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SAML SSO with Entra ID

How to set up SAML single sign-on between a third-party app and Microsoft Entra ID.

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/saml-sso-with-entra-id

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01

How do I set up SAML SSO for an app in Entra ID?

Add the app from the gallery (or create a non-gallery app), open Single sign-on → SAML, set the identifier (entity ID) and reply URL from the app's documentation, map the required claims (usually user principal name or…

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/saml-sso-with-entra-id

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02

Why does SAML SSO fail with an audience or reply URL error?

Because the entity ID or reply URL in Entra does not exactly match what the service provider sends — trailing slashes, http vs https, and a staging vs production URL are the usual culprits. The Entra sign-in log's error…

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/saml-sso-with-entra-id

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03

What happens when the SAML signing certificate expires?

Sign-in to that app fails for everyone. Entra creates a new certificate on request and lets you activate it after the app has been updated; set the notification email on the SAML page and calendar the expiry, or use the…

Solving Microsoft 365 · www.solvingmicrosoft365.com/guides/saml-sso-with-entra-id

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