https://www.gamespot.com/articles/monster-hunter-world-update-for-ps4-xbox-one-relea/1100-6458523/

A new update is update has been released for Monster Hunter World on PlayStation 4 and Xbox One. It addresses some of the action game's lingering bugs related to quests and weapon stats, among other things. This is patch 3.02 on PS4 and 3.0.0.2 on Xbox One.

Specifically, the patch fixes a bug related to the Kulve Taroth Siege quest line the mission would not play out as intended in some cases. If you ran into this issue, you can go back to Astera and speak to the Admiral; this should trigger the Kulve Taroth Siege as intended.