I have my laptop formatted with dual boot. The primary partition with Windows 10, and the secondary partition also with windows 10, but set to receive Windows insider preview updates. However, since the secondary partition reached build version 10586.164 it has not updated any further. What could be wrong? In the advanced updates the correct account subscribed to the insider program is listed, and fast ring selected. The Windows Insider app providing announcements and so on works fine also.