Microsoft Account notifications
If you don’t have your Microsoft Account (MSA) connected to your PC, starting in the next build you’ll start seeing notifications asking you to do so. You’ll need to connect the MSA that you registered for the Windows Insider Program
with (and accepted the “Microsoft Windows Insider Program Agreement”) in order to continue receiving new Windows 10 Insider Preview builds (both Fast and Slow rings) from Windows Update. If you already have your MSA connected to your account on your PC, then you’re all set. We’re introducing new infrastructure in Windows Update to help us deliver new builds more effectively to Windows Insiders, and ensure that we’re flighting builds to people who have registered and opted in to the program. Connecting your MSA also allows seamless access to Windows Insider-only functionality in the Windows Feedback app and Insider Hub too.