Enable / disable skype meeting in windows 10

hi , i want to enable / disable skype meeting option for outlook 365, but when i change the registry key it never impact on the outlook skype meeting. once i did this task i need to create a policy based fixlet to automatically fix the issue.

Over google it says and change the registry key value but never worked.

HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins

Does anyone know the right registry key path where i need to update / modify the value?