Libre Office Impress Remote via Bluetooth and Wifi doesn't work

I downloaded the app, activitated both remote and experimental features in libre office, restarted both devices multiple times. I tried it via bluetooth, in the same wifi network and via a hotspot from my phone. Also disabled firewell.

When I touch the device name in the app on my phone, it just fails. Please help!

Phone: Samsung Galaxy S8 @ Android 7.0 und Samsung Experience 8.1
Laptop: Dell XPS 13 9360 (i5-7200U) @ Windows 10