Allow update of gallery image for VMSS
When referencing a custom image in a VMSS from a Shared Image Gallery (Preview), it cannot be updated to refer to a new image. This results in an error code "PropertyChangeNotAllowed".
Today, a VMSS can be updated to a new image reference when it references a managed image that does not reside in a Shared Image Gallery.
Kshitij Agrawal commented
This was fixed, do you still see this happening?