@Subhra Shankar Banerjee Thank you for reaching out to us, As I understand you are trying to extract the identifieruris information for an application using this command Get-AzureADServiceprincipal.
This attribute identifieruris is available only for the apps which are registered in Azure AD ( i.e. App registration section of Azure AD).
What is the difference between App registration & Enterprise Application - https://learn.microsoft.com/en-us/answers/questions/270680/app-registration-vs-enterprise-applications refer to this QnA post where one of my colleague explained this in detailed.
Reference: https://www.youtube.com/watch?v=WVNvoiA_ktw - Azure AD App Registrations, Enterprise Apps and Service Principals
Identifieruris are visible to the apps which are registered via App registration section of Azure AD/within the app registration look for app manifest option where you will find all the settings of the application.
Let me know if you have any further questions, feel free to post back.
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