Macro variable is not set to Global and it is not added to the catalog task form in any Catalog Task activity of the workflow which is associated to the catalog item.

In order to display the Macro variable on the catalog task form, please perform the following steps:

1. Mark the Macro variable as Global by checking the Global option on the variable form.

2. Select the Macro variable and add it to the catalog task form in any Catalog Task activity of the workflow which is associated to the catalog item. You could add the variable to the catalog task form using the field "variables on Task Form" in Catalog Task activity.

For more details about the field "variables on Task Form" in Catalog Task activity, please refer to the Catalog Task workflow activity documentation https://docs.servicenow.com/bundle/london-servicenow-platform/page/administer/workflow-activities/reference/r_CatalogTask.html.