Unable to delete subnet and virtual network in azure

Question

I am just practicing the azure. And I created a virtual network and subnets.

Now I am not able to delete the subnet. I have disconnected all connected devices from the virtual network.

Here is the error getting while deleting subnet

Please help me to clean up the subnet and virtual network.

Thanks

Additional details

All resources in my account

And here is the subnets tab and error getting while deletion:

Subnet configuration:

Answer 1

As the error shows the subnet PrivateSubnet should be in use. And you can see it's delegated to the service Microsoft.Web/serverfarms. So you need to remove the delegated service first. Do it follow the steps here. When the delegated service list is empty, then you can delete the subnet as you want.

Update:

According to my experience, your subnet is in use network/PrivateSubnet/AppLink, it means there is a Web App integrate with your subnet at least. And I didn't see the Web App in your resource group. So I guess there someone else uses your subnet and his Web App still exists. You need to check it yourself.