Sending MS Windows window close command to RDP session

Hi all,

Very new to MacOS and BTT. I am using MS RDP to a Windows machine and have found that BTT works great sending some kb shortcuts to the RDP session. However, commands that require Alt+Fn do not seem to work.

I am using and external mac kb and trying to create a shortcut for Alt+F4. On the mac kb I am entering option+fn+F4. That combo works when entered directly in the RDP session but does not seem to be sent properly via BTT keyboard shortcut.

I hope this is enough information. If not please let me know how to clarify.