OneDrive Business

The OneDrive App works fine for Personal, but I when I use the OneDrive App for my Business account I cannot see any OneDrive files.

When I log one I have options for: Offline Files; Discover; Settings; Help and Feedback (but nothing about space used). When I clear this, I have a search screen for Shared Libraries (of which I have none), but I don't have a "Home" screen to browse files and folders.

I must be doing something incredibly stupid, but what?!

(PS I've tried reinstalling, same problem on ipad...)