Merge pull request #201074 from kof-f/patch-51

Adding fairfax regions and command

Author: PRMerger10

articles/virtual-machines/linux/image-builder-json.md

@@ -95,7 +95,16 @@ The location is the region where the custom image will be created. The following
 - East Asia
 - Korea Central
 - South Africa North
+- USGov Arizona (Public Preview)
+- USGov Virginia (Public Preview)
 
+> [!IMPORTANT]
+> Register the feature "Microsoft.VirtualMachineImages/FairfaxPublicPreview" to access the Azure Image Builder public preview in Fairfax regions (USGov Arizona and USGov Virginia).
+
+Use the following command to register the feature for Azure Image Builder in Fairfax regions (USGov Arizona and USGov Virginia).
+```azurecli-interactive
+az feature register --namespace Microsoft.VirtualMachineImages --name FairfaxPublicPreview
+```
 
 ```json
     "location": "<region>",