The new version of the app released on the iOS app store (v13.1.0) occasionally forced the user to log out. We have temporarily pushed out a fix from the backend to ensure users are not logged out, and we apologize for the inconvenience. The new iOS app with the permanent fix is already pushed out to the app store and is currently under review by Apple. If you forgot your username, please reach your IT administrator or hypercare support (firstname.lastname@example.org
This is currently not a problem on the Android app and only affects iOS users.