12-27-2020, 05:35 PM
It sounds like one device is still running version 2.9.6 but the other device is on version 3.0.0. You need to update both devices to version 3.0.0. You can check this under Settings->About. You may need to load the Microsoft Store app on the device that hasn't updated, search for MobileSheets and tap the update button on the store page.
Mike
Mike