Hi there,
Several users have reported the Quick assist update issue from the time it has moved to the store. Microsft states that moving Quick Assist to the store enhances the performance and security of the app.
Microsoft suggests pinning Quick Assist to the taskbar to avoid opening the old app and "refrain" from using the shortcut as it will launch the native app instead.
You can use Windows Powershell to reregister the User Account app. Open Powershell as admin and run this command.
Get-AppXPackage | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
Restart the PC and try reusing the app again
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