@Emil There are 2 total mentions of the hub on that page. One is an tiny numeric annotation that takes you to the fine print of the bottom of the page. The second is a single bullet in a list of other items. In my opinion, it’s not prominent enough if the entire integration relies on it. I understand it is on your customer (me) to read it all in detail.
More set up explanation / troubleshooting would be helpful.
The set of Wemo switches that the hub can not find are the newer small model WSP080. I have several Insight switches and model F7C063 that all come up no issue.