https://obsproject.com/forum/threads/to-set-up-a-private-stream-server-with-ums.5401/

1、obs: customer steam  rtmp://xxx.xxx.xxx.xxx:5130/live/name
5130 is Unreal media server live port

2、Unreal media server: New Live Broadcast ->  Rebroadcast live RTMP / RTSP / MEGG-TS / MMS Stream ->

Live broadcast Alias :  name
chosese   PUSH   rtmp://     no auth for test

 then

use unreal streamplayer   or vlc

vlc
rtmp://xxx.xxx.xxx.xxx:5119/live/name
5119 is Unreal media server players port