https://www.gamespot.com/articles/psn-servers-down-for-many-ps4-users-right-now/1100-6456371/

Following an outage earlier this week, the PlayStation Network is again experiencing issues for users on PS4 and PS3. This affects a wide variety of areas of the service, including the ability to log in. That will impede your ability to play games online--including the newly released Monster Hunter World and Dragon Ball FighterZ--and any number of other things.