How Can I Stop DCU 5.5.0 From Scanning for Updates?

HKLM:\SOFTWARE\Dell\UpdateService\Service\UpdateScheduler\CurrentUpdateState = Scan.  Is this why my computers are prompting users to install Dell updates even though I have DCU configured for manual scan only?

If yes, how do I set this so it doesn't happen again?  If no, why are my workstations, including customer-facing ones, showing notifications of available updates? 

For history buffs, here's what's going on: I have deployed Dell Command | Update 5.5.0 to my workstations.  I create the configuration using the CLI:

.\dcu-cli.exe" /Configure -secureBiosPassword ## Allows the user to provide the unencrypted BIOS password securely..\dcu-cli.exe" /Configure -autoSuspendBitlocker=enable ## Allows the user to enable/disable the automatic suspension of BitLocker when applying BIOS updates..\dcu-cli.exe" /Configure -scheduleManual ## Allows the user to disable scheduled updates..\dcu-cli.exe" /Configure -lockSettings=enable ## Allows the user to lock all the settings in the UI.\dcu-cli.exe" /Configure -exportSettings="C:\Temp"

Checking the Registry, I see HKLM:\SOFTWARE\Dell\UpdateService\Clients\CommandUpdate\Preferences\Settings\Schedule\ScheduleMode = ManualUpdates.

I've been using the same configuration for several previous versions of DCU and I never received any reports of problems like this, but about a month ago, a number of computers started showing notifications of dell driver updates ready to be installed.  

I checked the HKLM:\SOFTWARE\Dell\UpdateService\Clients\CommandUpdate\Preferences\Settings\Schedule\ScheduleMode value and confirmed it was set to ManualUpdates.  Now that I had a reason to keep looking, I noticed HKLM:\SOFTWARE\Dell\UpdateService\Service\UpdateScheduler\CurrentUpdateState is set to 'Scan'.