Unsure if this request is even possible but I was looking for something along the lines of a basic login system which will make it easy enough to limit it so only those with access will be able to play your game while also spreading it via the internet.
Hello,
you would better look at world browsers possibilities you can find like in coherent ui or some threads here. And set your login system in the web page.
Depending on your UI solution, with HTML5 plugins you can of course just integrate it into the web page. If you wanted to use UMG or Canvas provided within Unreal, you can use a plugin such as VaRest.