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Taskerのヘルプに以下のように書いてあるがヘルプすら読まないのか？

This action requires either root, ADB WiFi to be enabled or permission to write secure settings.

If you can root your device, that's preferable because it'll always work.

On non-rooted devices you can enable ADB WiFi to make it always work.

Other than that it'll not always work and often simply change the status of the toggle in the settings' UI but not really toggle the setting itself.