Why is Delegated Permission Required When Creating an Azure Application User?

 

🎭 A Simple Real-Life Example

Imagine you work in a big office, and you need access to a locked room. There are two ways you can enter:

1️⃣ You walk in with your boss (delegated permission) – Your boss has access, and you are allowed in only while they are with you.
2️⃣ You get your own key (application permission) – You can enter anytime, even when your boss is not there.

This is exactly how permissions work in Azure!

🔹 Understanding Delegated Permission in Azure

When you create an Azure Application User, it needs permission to access resources like Dynamics 365 or APIs.

  • 🔑 Delegated Permission → The app acts on behalf of a real user (requires an active user session).
  • 🗝️ Application Permission → The app has full access to the resource, even if no user is logged in.

🔎 Key Differences

FeatureDelegated PermissionApplication Permission
Acts as a user?✅ Yes❌ No
Requires login?✅ Yes❌ No
Follows user’s access?✅ Yes (limited access)❌ No (full access)
Security risk?🔒 Low⚠️ High (if misconfigured)

🔹 Why is Delegated Permission Needed?

✅ User Context – The app follows the permissions of the logged-in user.
✅ Security – The app cannot access data when no user is logged in.
✅ Controlled Access – The app gets only the permissions the user has, avoiding unnecessary access.

🔹 Real-World Example: Customer Support System

Imagine a customer support agent logs into an app that connects with Dynamics 365:

1️⃣ The app uses the agent’s credentials (delegated permission) to fetch customer details.
2️⃣ The agent only sees data they are allowed to access based on their role in CRM.

👉 What if the app had full (application) permissions?
🚨 The app could access everything, even if the agent wasn’t logged in! This is a security risk.

🔹 Conclusion

Delegated permissions ensure security and controlled access by allowing the app to work only when a real user is logged in.

It’s like entering a restricted area only when your boss is with you, instead of having a master key to everything! 🔐😊


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