Are those elements created locally (only within the workspace project) or can you see the secments/calculated metrics in your asset inventory?
(or open project, got to desired segment, hit the i-icon and see if there is a link „make public“ in the element description)
I think you can‘t share components which are only created within a workspace project...
They're listed in the Segments components inventory. And even when I create a metric or segment within the workspace, they've always been created globally - meaning I can see them in my inventory, use them across the Adobe Analytics products, and share them individually and manually. It's only the shortcut that doesn't work to 'share all' associated with the specific Workspace.
Did you raise a ticket? I think this is a bug...