https://www.techradar.com/news/fallout-76-will-not-support-cross-play-for-a-number-of-reasons-says-bethesda

Bethesda has confirmed that Fallout 76 will not support cross-platform play.

Following the news that Sony is finally enabling cross-play for Fortnite, Bethesda vice president Pete Hines retweeted the news on Twitter accompanied by the clap emoji. This caused fans to assume Hines was hinting at possible cross-play for Fallout 76.