While each store may cross-play with other versions on the same platform, it cannot play with versions in a different cross-play group.
Borderlands 3 offers cross-play functionality across all major platforms, allowing players to team up with friends regardless of their gaming system. However, it's crucial to understand that cross-play does not mean cross-progression; while you can enjoy gameplay with others on different platforms, transferring your save file between them is not always possible. You may switch between various PS or Xbox versions, but transferring a save from a console to a PC remains unfeasible.