You can block access for applications that don't use the modern authentication libraries to connect to SharePoint Online. This would include Office 2010-based applications, as well as the legacy OneDrive for Business (Groove) client and most third-party clients.

The available settings are as follows:

• Allow access
• Block access

If you configure unmanaged device restrictions to Allow limited, web-only access or Block access, the Block access option on this page is automatically selected.

In the next section, we'll learn how to manage sync settings from the OneDrive admin center.