The option to share data between groups that are outside of content creators organization must not be present unless the content is public.
Last Published: January 29, 2015ArcGIS Online
Bug ID Number
November 17, 2014
March 30, 2022
After review by the development team, it has been determined that this issue is related to a known limitation with the software that lies outside of Esri's control. The issue's Additional Information section may contain further explanation.
This is a known limitation, for now.
Only share content to the group instead of the group and the organization. This prevents the option to share from appearing when viewing the Item Details of content located in a group.