I have used Resilio-Sync on Kodi before.
This time instead of being offered a Web-Gui,I am offered a user and password interface,no setup menu as before where you setup user and password and progress to adding a key or folder.
It does the same if I attempt the Gui on my phone.
Maybe the image has a default user and password?
Its CoreElec running on an Amlogic Minix.
Fixed it.It was simply an IP address double up.