See explanation below.
Explanation
Step 1:
Find and select application corplod8548987n3:
1. In the Azure portal, on the left navigation panel, click Azure Active Directory.
2. In the Azure Active Directory blade, click Enterprise applications.
Step 2:
To add an IP restriction rule to your app, use the menu to open Network>IP Restrictions and click on Configure IP Restrictions

Step 3:
Click Add rule
You can click on [+] Add to add a new IP restriction rule. Once you add a rule, it will become effective immediately.

Step 4:
Add name, IP address of 11.0.0.11, select Deny, and click Add Rule

References:
https://docs.microsoft.com/en-us/azure/app-service/app-service-ip-restrictions