@Aliya When a subnet is used for an injected service it is delegated to that service and you can see that info in both portal and CLI as shown below:
We have a block in Azure that prevents customers from creating anything else in that subnet. It’s a property of the subnet that cannot be modified. It is not a policy that is visible to the customer.
Hope this helps. Please let us know if you have any further questions and we will be glad to assist you further. Thank you!
Remember:
Please accept an answer if correct. Original posters help the community find answers faster by identifying the correct answer. Here is how.
Want a reminder to come back and check responses? Here is how to subscribe to a notification.