OneDrive iPhone app preview Office documents shows blank view

The OneDrive app on my iPhone used to show previews for Office documents (Word, Excel, PowerPoint). Now when I tap an Office document, I see a blank view with the document name in the header. Previewing PDF documents and images works fine. When I disable Settings > Preview Office Documents, Office documents open fine in the Word, Excel, or PowerPoint app. I have tried signing out and back in. I am not sure what else to try. Has anyone experienced this problem?