Users cannot share ArcGIS Online profile with everyone if the setting for 'Members can share content outside the organization' is unchecked.
Last Published: March 31, 2015ArcGIS Online
Bug ID Number
March 18, 2015
August 21, 2020
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 by design. http://doc.arcgis.com/en/arcgis-online/administer/configure-security.htm