I've installed vRNI many times, pretty simple process, however the one and only time i had an issue, it turned out the IP i was assigned was also been used else where. Duplicate IP. So, check the IP, also worth checking the interoperability, is it compatible with your current setup? vCenter, NSX....
Hope that helps.
thumbs up if it helps and tag as Correct answer if the above was the cause.
Your issue was with VRNI or VRLI? I supposed that the same issue could apply to VRLI - for example of the license request was for an IP address other than what actually got processed at VMWare. Or if a second device literally took on the same IP address. I'm away for about a week so I won't be able to try out this line of investigation for a bit. But I appreciate the idea.