Is it possible to share a preview of my story map with a couple of people outside of my organization so they can view it?
Hi Jessie -- Unfortunately, ArcGIS Online doesn't have that capability at the moment. The best option is for you to provide those outside collaborators with limited permissions LEVEL 1 accounts and share your story map and it's associated content with those individuals via a group.
Levels, roles, and privileges—ArcGIS Online Help | ArcGIS
I hope this will be an option in the near future. It would be useful.
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