Following Bungie's , which is now available for , crossplay was officially implemented into Destiny 2 at the start of Season of the Lost.
Moreover, a workaround has been provided that affected players can try in order to overcome this situation.
Its current best guess for a release date is sometime in 2021 at the earliest.
Otherwise, everyone will be able to play together, which should make Destiny 2 a much easier social experience to share.