My store was down all day on Sunday I think I was. I tried the wsreset and didn't have any luck. After a 2 hour hold with MS support I was told it was a known issue and they were working on it.
Since then, it's worked then not worked all of this week. It's an issue on MS end and I assume they have no clue how to fix it since for me at least, its been going on for almost a week..