@user789 So, let me give you some more information to what I think. Each UF is also a splunk installation. It will have a management port 8089 running. That is only used when you try connecting to the UF remotely and perform splunk commands. You can disable the management port on the UF, no one cares.
Secondly, are you referring to the Forwarder Management on the Deployment Server? If this is the place you are not seeing your UF, then, just enable iptables rule for OUTPUT from your UF ( ANY to ANY ) on port 8089/TCP. This will make the UF to be able to pass the communication to the DS. And the DS listens on port 8089 which is the DS's management port.
And thirdly, Have you given the DS info? You can do this via an app in etc\apps\customname\local\deployment.conf
If you have done all the above and splunk service is running you should see the UF as long as your DS is also accepting 8089 Communications. And if you see it on the DS and data is not coming to your indexer, let us know.
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