@joeking2023202 This started happening to me, today, March 21 2024 after the Sugar Rush content was push to server(s). I get this error trying to access Challenges, Solo Battles and the Live Events areas.
I thought maybe there were bugs associated with the two Sugar Rush players I added to my lineup so I could start working on the SR Live Event objectives (I was able to access SR Live Event area before I put two players in, now I get the error you linked trying to access ANY Live Event area) So, to test the bugged SR player theory, I removed both players and attempted to access the previously mentioned three areas in MUT, but got the same error message without SR players in my lineup.
Can EA person give players a heads up about this? Have you guys taken the server(s) offline to "fix" something but left the shell of a game up and running?