Then it really looks like a problem I'm aware of, but I still do not find a method of how to "hack it". Seems that on Android 8, because of some issue directly in Android, apps running on background can't connect to 3rd party service over method we use (Locus Map & BRouter). On Android 7 and 9+, this problem does not exist. Also with GraphHopper (online), no problem ... stupid.