The per-group sharing controls are a new Office 365 feature that allows SharePoint Online administrators to limit the ability to share with external users to those in specified security groups. These controls affect OneDrive for Business and SharePoint Online in Office 365.
Per-group sharing controls will appear in two phases. First, you will notice a new setting that allows users to specify a set of security groups that are allowed to share to authenticated external users and via anonymous links. Second, another option will appear that allows admins to specify a set of security groups that are allowed to share to authenticated external users only.
We'll be gradually rolling this out to First Release customers in early June, and then continue the roll-out to all other tenants over the following weeks.
What do I need to do to prepare for this change?
There is nothing you need to do to prepare for this change
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