When trying to save files to Box for iOS or Box for EMM from Office applications or attempting to attach a file from Box to an Outlook message, users receive the message below.
With the release of iOS 11, Apple released the Files application. The Box applications use this Files functionality to provide access to files in other applications. The Files App + Box integration does not support the app-specific password at this time, so we cannot reach Box from the Office apps. See here for more limitations with the Files app integration.
To use these integrations, you will need to disable to passcode to the Box application.