https://wccftech.com/borderlands-3-crossplay-update-out-now-playstation-left-out/

Gearbox Software and 2K announced the release of the eagerly awaited Borderlands 3 crossplay update on PC (both Steam and Epic Games Store), Mac, Xbox One, Xbox Series S|X, and Google Stadia. That's right, PlayStation users are the only ones left out, as Gearbox president Randy Pitchford had already hinted a while ago.

Good news or bad news first? Good News: An update for Borderlands 3 has been prepared for release that includes full crossplay support across all platforms. Bad News: For certification, we have been required by the publisher to remove crossplay support for PlayStation consoles.