Can’t link sydrive to outline+

Outline+ is an app that allows me to edit OneNote documents on my iPad. It has an option to sync to skydrive. I have set this up before. I had to restore my iPad a while after I set it up. I re-downloaded the app, and went to sign in. I get an error saying "Wrong credentials. Please try again" According to the Outline+ help, other people are having the same problem. They where told that it has something to do with skydrive. I had this set up before, but I can't now. I also need this to work for school. I believe this has something to do with some API as I can sign in to skydrive on my computer just fine, just not on the app and the fact that Outline+ is saying that it has something to do with skidrive. If anyone can help, I would appreciate it. Thanks.