If a mandatory Registry item had been archived then unarchived, this will not be restored to the locations, this article will explain what needs to be done.
You will need Administrator permissions to be able to do the below. Contact an Administrator if you do not have access.
Go to Registry > Manage items. Select view archived.
Click the three dots next to the item you would like to unarchive then click Restore.
Note that the item in the example above is a "Mandatory" item. These items are automatically adopted at all locations.
For the restored mandatory item to show at all locations again, first click the three dots next to the restored item, then click Edit.
Untick Mandatory then save the item. Edit the item again then tick Mandatory again.
Now go to the Overview tab then select a location. The item will now be available at all locations.