Update pre-provision.md

updated on the 2021.09C change that re-runs device ESP during user ESP

Author: JuanitaBaptiste

memdocs/autopilot/pre-provision.md

@@ -149,6 +149,8 @@ If the pre-provisioning process completed successfully and the device was reseal
 - If using Hybrid Azure AD Join, the device will reboot; after the reboot, enter the user's Active Directory credentials.
 - Additional policies and apps will be delivered to the device, as tracked by the Enrollment Status Page (ESP). Once complete, the user can access the desktop.
 
+A change was made in the 2021.09C release to re-run the device ESP during the user flow so that both device and user ESP will be run when the user logs in. This change allows ESP to install additional policies that may have been assigned to the device after it was provisioned in the technician phase.  
+
 > [!NOTE]
 > If the Microsoft Account Sign-In Assistant (wlidsvc) is disabled during the Technician Flow, the Azure AD sign in option may not show. Instead, users are asked to accept the EULA, and create a local account, which may not be what you want.