Add entry for subscription enable/disable

Author: asinn826

articles/virtual-machines/troubleshooting/media/virtual-machines-serial-console/virtual-machines-serial-console-subscription-disabled-error.png

@@ -25,7 +25,8 @@ There are a set of known errors within the Azure Serial Console. This is a list
 Error                            |   Mitigation
 :---------------------------------|:--------------------------------------------|
 Azure Serial Console requires boot diagnostics to be enabled. Click here to configure boot diagnostics for your virtual machine.![Boot diagnostics error](./media/virtual-machines-serial-console/virtual-machines-serial-console-boot-diagnostics-error.png) | Ensure that the VM or virtual machine scale set has [boot diagnostics](boot-diagnostics.md) enabled. If you are using serial console on a virtual machine scale set instance, ensure that your instance has the latest model.
-The VM is in a stopped deallocated state. Start the VM and retry the serial console connection. ![Deallocated error](./media/virtual-machines-serial-console/virtual-machines-serial-console-deallocating-error.png) | The VM or virtual machine scale set instance must be in a started state to access the serial console. Start your VM or virtual machine scale set instance and try again.
+Azure Serial Console requires a virtual machine to be running. Use the Start button above to start your virtual machine. ![Deallocated error](./media/virtual-machines-serial-console/virtual-machines-serial-console-deallocating-error.png) | The VM or virtual machine scale set instance must be in a started state to access the serial console (your VM must not be stopped or deallocated). Ensure your VM or virtual machine scale set instance is running and try again.
+Azure Serial Console is not enabled for this subscription, contact your subscription administrator to enable.![Subscription disabled error](./media/virtual-machines-serial-console/virtual-machines-serial-console-subscription-disabled-error.png) | The Azure Serial Console can be disabled at a subscription level. If you are a subscription administrator, you may [enable and disable the Azure Serial Console](./serial-console-enable-disable.md). If you are not a subscription administrator, you should reach out to your subscription administrator for next steps.
 A "Forbidden" response was encountered when accessing this VM's boot diagnostic storage account. ![Storage account firewall error](./media/virtual-machines-serial-console/virtual-machines-serial-console-firewall-error.png)| Ensure that boot diagnostics doesn't have an account firewall. An accessible boot diagnostic storage account is necessary for the serial console to function. Serial console by design cannot work with storage account firewalls enabled on the boot diagnostics storage account.
 You do not have the required permissions to use this VM with the serial console. Ensure you have at least Virtual Machine Contributor role permissions.| The serial console access requires you to have contributor level access or above on your VM or virtual machine scale set. For more information, see the [overview page](serial-console-overview.md).
 The storage account '' used for boot diagnostics on this VM could not be found. Verify that boot diagnostics is enabled for this VM, this storage account has not been deleted, and you have access to this storage account. | Double check that you have not deleted the boot diagnostics storage account for your VM or virtual machine scale set