On March 30, 207, we are adjusting how anonymous access and internal links (people within my organization) are used in SharePoint Online and OneDrive for Business – to improve reliability and manageability. We are standardizing how sharing links are used and registered in the system to offer you the greatest levels of creation, visibility and control.
How does this affect me?
On March 30, SharePoint Online and OneDrive for Business will adjust aspects of anonymous access and internal links (people in my organization) that may impact any links generated before May 2016.