You may be required to enable the following permission to run the Meeting Room 365 app in Kiosk mode on later Samsung devices running recent versions of Android.
Navigate to Apps. Navigate to Settings, and then tap Apps.
Navigate to Special access. Tap More options (the three vertical dots), and then tap Special access.
Tap Apps that can appear on top or Draw over other apps. Tap Appear on top, and then find Meeting Room 365. Turn on the switch next to it.