add information for azure app usage of the cmdlet

Author: mayanksahu11

exchange/exchange-ps/exchange/Export-ContentExplorerData.md

@@ -48,6 +48,7 @@ The following list describes best practices for scripts using this cmdlet:
 
   > [!TIP]
   > To support unattended scripts that run for a long time, you can use [certificate-based authentication (CBA)](https://learn.microsoft.com/powershell/exchange/app-only-auth-powershell-v2).
+  > Add `ContentExplorerListViewer` rolegroup to the Service Principal Identity, while using azure app.
 
 To use this cmdlet in Security & Compliance PowerShell, you need to be assigned permissions. For more information, see [Permissions in the Microsoft Purview compliance portal](https://learn.microsoft.com/purview/microsoft-365-compliance-center-permissions).