Failed to deactivate the network extension

I can do these operations by providing the argument to the app and I
able to perform all operations from the terminal.

I see questions like this a lot so I want to clarify one thing: The SystemExtensions framework is intended to be used by a GUI app to load and unload system extensions in response to user actions. It’s not meant to be called from a command-line tool, regardless of how that command-line tool is packaged. Calling it from a command-line tool is unsupported and may yield weird results.

I recently filed a bug to get this clarified in the framework’s documentation (r. 70246597). We also have a bug on file to add more options for installing and uninstalling system extensions (r. 66312716), although if you have specific requirements in that space it wouldn’t hurt to file your own bug describing those requirements.

Finally, a lot of folks who ask about this are primarily focused on deploying to managed environments, and such environments can do more with system extensions using MDM.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@apple.com"