I rebooted and it worked. Only thing to add is that I also needed to start the INDI server from INDI Web manager.
Just launching the INDIHUB system does not do it. I also had to make sure the INDIHUB Agent is Online in share-mode, which I did from the INDI Web manager. This step may seem obvious to some, but to a beginner who is simply following the steps outlined on the website.