Adding multiple authentication repositories in IAG

Source: Microsoft Support

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This article describes how to add multiple authentication repositories (AD, RSA) that can be used in a single Portal trunk.

After you define more than one Authentication and User/Group Servers repository, you can add the additional repository to the trunks Authentication tab. When the end user is prompted for authentication, they will have a drop down option to specify which repository to use. You also have the option to require that the "User Must Provide Credentials for Each Selected Server" that is listed in the Select Authentication Servers box.

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