Learn Editor: Update device-control-deploy-manage-gpo.md

Author: dkouzmanovMSFT

defender-endpoint/device-control-deploy-manage-gpo.md

@@ -61,7 +61,7 @@ To configure the device types that a device control policy is applied, follow th
 
 1. On a computer running Windows, go to **Computer Configuration** > **Administrative Templates** > **Windows Components** > **Microsoft Defender Antivirus** > **Device Control** > **Turn on device control for specific device types**.
 
-2. In the **Turn on device control for specific types** window, specify the product family IDs, separate by a pipe (`|`). Product family IDs include `RemovableMediaDevices`, `CdRomDevices`, `WpdDevices`, or `PrinterDevices`.
+1. In the **Turn on device control for specific types** window, specify the product family IDs, separate by a pipe (`|`). This setting must be a single string with no spaces or it will be parsed incorrectly by the device control engine causing unexpected behaviors. Product family IDs include `RemovableMediaDevices`, `CdRomDevices`, `WpdDevices`, or `PrinterDevices`.
 
 ## Define groups