Gears of war 3 series s

Very early 90's from the NES upwards. Had every console after that.

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Gears of War series is my favorite game. 3 in particular.

1.Gears of war (series 1,2&3)

2.Morrowind series.

3.Borderlands series

but for example in Gears of war 3 we were playing on the Xbox Series S and we could enter each other's waiting room normally, but in CODBO2 not why?

i am not looking for the beta of gears of war, but for the full Gears of War series for xbox 360 and fallout 3, to play both on my xbox one.

Gears of War Series, minus Judgment and preferably Gears of War 3. They won't be missed once the X1 hits because I'll still be playing them.