Split screen and invite friends?

Actually you can, I've done it multiple times 

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@TimeWalk3r wrote:
Split screen is local only. You can't do anything online while in split screen mode so sadly it's not possible to invite online friends in any of the possible modes.

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Online split screen was added many months ago, my friend.  Enjoy!

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@Lindz5223 wrote:
Such a bummer. I was really hoping we could all play together, like you can on Minecraft. 👎

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You can only have up to two players on split screen on one console.  But you can have up to four players together in your backyard if at least two consoles are involved (two players on each console).

You can find plenty of posts here describing how to use split screen if you type "split screen" into the search function.  Inviting friends who are on their own consoles int your back yard can be done in several ways, perhaps the simplest being the world menu in the plant or zombie base.

how? we have xbox one S.

First get two players on the same console in your backyard then go to the tv by the character select booth.  Choose the option for split screen. After that join your friends backyard.  Honestly having four people on one screen could make things quite tough.