@the_Ki11aBEE Both versions have crossplay (the last gen one is PS4/Xbox), so that's not a good indicator unfortunately. The simplest way to check is whether the Xbox tile has "X/S" in the bottom left corner. If it does, then they're loading the right version.
Edit: Here's a photo of my Xbox home screen so you can see how both versions look, in case it helps at all.
I was searching for fix for this same issue.
I am playing on pc and my friend on Xbox siries X.
He is playing siries X/S version on the game and we both have crossplay on.
Every time i send him frien request error pops out.
Please help
