I found a bug with disabling plugin for Outlook. I would like to disable "Adobe Document Cloud for Microsoft Outlook - Acrobat" via group policy by adding an option bAdobeSendPluginToggle to the registry according to the Adobe instructions:

https://www.adobe.com/devnet-docs/acrobatetk/tools/PrefRef/Windows/Workflows.html#idkeyname_1_31837

[HKEYLOCALMACHINE\SOFTWARE\Wow6432Node\Policies\Adobe\Adobe Acrobat\DC\FeatureLockDown\cCloud]
"bAdobeSendPluginToggle"=dword:00000001

But it doesn't work.

I would be grateful to you for solving this problem.