A Microsoft file hosting and synchronization service.
Hi guys, after seeing a few replies that their personal vault randomly works today, I just tried mine and it DOES work now on my phone and on the webpage now. I haven't got a chance to try PC onedrive app. Not entirely sure if the problem is resolved, but wanna share the news in case it works for everyone now.
EDIT: I didn't try accessing my personal vault more often than about once a week.. so hopefully trying every day is not the required step for everyone as the other posts suggested :)