I think you have missed the point. Others have shown the way, but a lot of people are/were having a problem enabling Direct Play via P&F.
There is at least one post in this too long thread that mentions Skype , or Anti-Virus as a source of conflict, and disabling Skype
(or other potential conflicting software or Services) can help those having problems with enabling Direct Play.
- I see others have gone the extreme route and reinstalled Win10, which would also have removed any conflicting software.
My guess it they didn't read the post regarding Skype, or didn't troubleshoot other possible conflicting software.
.