Usemanager with multiple subscribers not working

Hi guys
I have a p4 sytem with ROS running 2 hotspots servers and usermanager.
The two hotspots uses the userman to authenticate clients, the userman has a single router (127.0.0.1).

Now in an attempt to seperate users for the hotspots, I created another subscriber and reconfigures the earlier subscriber.

Hotspot 1, IP=172.21.51.251
Hotspot 2, IP=192.168.0.1
Subscriber 1, login=Mikrotik has a single router with IP=172.21.51.251 formerly 127.0.0.1
Subcriber 2, login=Mik, has a single router with IP=192.168.0.1
Each subscriber has a customer

What am I suppose to do in /router?
I have a single radius server there with IP=127.0.0.1
Am I suppose to remove it and add two different IPs (maybe 192.168.0.1 & 172.21.51.251)?
Please I’m in a fix here, I have tried everything I think should be done and yet nothing is working, all i get is “RADIUS server is not responding”

The address that needs to be typed in under /router on your UM, is the address from which the NAS (Network Authentication Server or remote hotspot in your case) will use to authenticate itself on the RADIUS/UM. The simplist way of finding out what that address is, is to login to your hotspot using Winbox. Then go to TELNET (on the left), choose SSH and fill in the details of your UM router. Once logged into your UM, type the following:
/user active print

Find the user logged in from Telnet, and the IP you find there is the IP you should use under the /router field in UM.

I hope I made sense and that it helped! G