After updating Windows 10 devices at a customer today – we are seeing this message in the Windows Update part of the Settings App.
Good news! The Windows 10 Creators Update is on its way. Want to be one of the first to get it?
After some searching I found that this reghack will remove it.
And now it was just to create a Windows Group Policy Object (GPO) with a Group Policy Preferences (GPP)
And now it is gone in the Settings App