Hi Cory,
Are you able to create new "View" of the source feature layer of your survey via ArcGIS Online?
i.e., log into ArcGIS Online - open your survey folder - open the source feature layer item (doesn't contain "view" in title) - try "Create View Layer" at right menu. The viewer settings of Survey123 website is essentially doing the same thing. If you are able to do so, please back-up your data, and delete the Stakeholder view layer (surveyName_stakeholder) in survey folder via ArcGIS Online, and go back to Survey123 website's Collaborate tab, under Viewer's setting it should be reset to private now, and then share it to your groups. Please wait until the saving is all done to close browser tab, otherwise it will break the settings.
Thanks and best regards,
Jody