The hostname for a Splunk forwarder on a domain controller appears in forwarder management correctly, but why can't I search for it?

Hi everyone, I have an issue with one of my forwarders which for some reason will appear with its correct hostname in the section of forwarder management, however, when doing a search with the field `host = [server name]`, it will not appear. I have made a request for it to be reinstalled with our typical script which has worked for all the rest, however, this one just does not want to work and the issue is that the server is actually a Domain Controller. The only moment I will find information about the server is as an account name which is really bizarre as all the other servers hostname works perfectly except for this one. Any help would be greatly appreciated. Thanks,