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- When you register an application in Entra ID, you can create a secret for the app and a new Secret ID is generated. which is used as a shared secret between the application and the authentication service.
The Secret ID can be used to retrieve the client secret value, which is essential for the application to authenticate itself to the authorization server and request access tokens. This process ensures that only authorized applications can access the resources they need. - As of now there is no option to assign multiple URLs to the secret. but you can add multiple redirect URL to particular application, and this can use the same client secret for all of the redirect URIs
- For external users generally recommended to allow users to register with the email, as this is a convenient and secure way to verify their identity. if the users is within the organization assign the application access to internal users.
Reference: https://learn.microsoft.com/en-us/entra/identity-platform/quickstart-register-app?tabs=client-secret#add-credentials
https://learn.microsoft.com/en-us/entra/identity-platform/msal-client-application-configuration#client-id
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Thanks,
Akhilesh V.
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