@JamesJ @yariplus here is how the whole outgoing link thing works...
The warning page only works if the links are not setup to open in a new tab/window.
There is an option under user settings that lets every user specify if they want links in posts to open in new window. If the option is checked under user settings, every link opens in a new tab for that user and they don't see the warning page because they are not actually leaving the origin site and the link is opening in a new window.
This used to be the only option and it let's the user decide how they want it to work.
Now there is a new option in the
nodebb-plugin-markdown plugin settings page that let's admin specify to have every link open in new tab/window.
I believe this was added recently. If this option is checked, every link is opened in a new window and just ignores the setting under user settings (this is wrong if you ask me).
So, even if you have the outgoing links warning enabled... it depends on two other settings if it shows up or not.