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To configure an OAuth2 external identity provider for a Power Apps portal, the first step you should take is to register your app with the identity provider. This involves creating an account or signing up on the identity provider's website.   Once you have registered your app, you will receive a client ID and a client secret. The client ID is a unique identifier for your app, while the client secret is a confidential key used to authenticate your app with the identity provider.  Next, you will need to configure the identity provider settings in your Power Apps portal. This involves navigating to the portal's settings and finding the section for external identity providers. You will typically find options to add or configure the OAuth2 provider.  In the configuration settings, you will need to enter the client ID and client secret that you obtained during the registration process. You may also need to provide additional information, such as the authorization and token endpoints specific to the identity provider.  After saving the configuration, you can then test the integration by attempting to log in to your Power Apps portal using the external identity provider. If everything is set up correctly, you should be able to authenticate and access the portal using your external identity provider credentials.  It's important to note that the specific steps and options for configuring an OAuth2 external identity provider may vary depending on the Power Apps portal version and the identity provider you are using. Therefore, it's recommended to refer to the documentation or guidelines provided by the identity provider and Power Apps for more detailed instructions.

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