If you are trying to remove apps such as Alarms & Clock or other pre-installed apps, you won't be able to do that neither through the Control Panel, nor through the Windows Store. To remove such apps you need to use the Windows PowerShell:
Note: These are the "real names" of other pre-installed apps:
If you ever decide to reinstall these apps, type the following command in the PowerShell:
Get-AppXPackage | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
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