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This can help to streamline the authentication flow and improve the user experience, especially when the user has multiple IdPs IdPs to choose from.
When a user attempts to authenticate with an SP, the SP can provide a list of supported IdPs to the user. If the SP has a preferred IdP, it can suggest that IdP to the user by including an IDP hint in the authentication request. The IDP hint can be in the form of a URL or an identifier, such as the IdP's entity ID.
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