Add Single Sign-On to a Portal | Adobe Marketo
https://experienceleague.adobe.com/docs/marketo/using/product-docs/administration/additional-integrations/add-single-sign-on-to-a-portal.html
Marketo only supports Identity Provider-initiated (also known as IdP-initiated), in which the user first launches the Idp login page, authenticates, then navigates to My Marketo. Additional Notes Sync-up time - For a new user, there is about a 10 minute delay before an initial SSO request is processed.
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