Policy
Configures the Chat icon on the taskbar
This policy setting allows you to configure the Chat icon on the taskbar. If you enable this policy setting and set it to Show, the Chat icon will be displayed on the taskbar by default. Users can show or hide it in Settings. If you enable this policy setting and set it to Hide, the Chat icon will be hidden by default. Users can show or hide it in Settings. If you enable this policy setting and set it to Disabled, the Chat icon will not be displayed, and users cannot show or hide it in Settings. If you disable or do not configure this policy setting, the Chat icon will be configured according to the defaults for your Windows edition.
03a58a90006a ConfigureChatIcon Registry
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HKLM\Software\Policies\Microsoft\Windows\Windows Chat\ChatIcon Policy notes
This policy setting allows you to configure the Chat icon on the taskbar. If you enable this policy setting and set it to Show, the Chat icon will be displayed on the taskbar by default. Users can show or hide it in Settings. If you enable this policy setting and set it to Hide, the Chat icon will be hidden by default. Users can show or hide it in Settings. If you enable this policy setting and set it to Disabled, the Chat icon will not be displayed, and users cannot show or hide it in Settings. If you disable or do not configure this policy setting, the Chat icon will be configured according to the defaults for your Windows edition.