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HELP PLEASE! Cant join.

Its broken for everyone. There is no workaround.

There is a fix, open the xbox app on windows 10 (if it is on windows 10) or on your xbox one go to network conectivity, and make sure that the multiplayer servers are connected. If it isn’t, correct it (the app will give you instructions) and then you’ll be able to play.

I solved mine with this, happened to me yesterday, let me know if it works for you Sign in Status Changed