Doesnt deserve a single star

As a 25 year IT veteran and Microsoft Partner, I cannot believe this app doesnt work. It simply wont let me log on. Sure I have a phone certificate issued by Microsoft Office 365 and MFA, but that doesnt stop apps like Box and Dropbox from working. How come one of the worlds largest software companies cant get a cloud storage app to work on an iPhone?

m0ph3tc@t about OneDrive for Business (replaced by the OneDrive app)