I got on here looking to see if anyone was having this same issue. I'm on PS5, my friend on Xbox and we can't join each others co-op invite. I did notice when I search for co-op games the people I match with are only playstation players. My friend only matches with Xbox players. We both have cross play enabled. Hopefully this gets fixed.
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LegendNdaMakin_PSN
@LegendNdaMakin_PSN