On November 9, 2020, OIT made changes to how sharing links work by default to enhance security for file sharing in OneDrive and SharePoint Online. At the center of these changes is a change to the default behavior whenever a user shares a link or folder. The current default of “Anyone with the link” will change  to “Specific people (only the people the user specifies).” This allows external sharing, but reduces the chances of accidentally sharing a link that is open to the public. 

Details about this change, including information about changes to Anonymous links, is available in the OIT Knowledge Base.