Ultimate Team: Servers cannot process request at this time

I completed an Ultimate Team 201 challenge and went to go to the next challenge and it never got out of the loading screen. Had to restart the game and I got that message after I tried to go back into the challenge. Boots me back to the main menu. And now it just did the same thing after I completed a Standouts challenge. Idk what to do at this point because I can't complete all the milestones.