I have gone through all of the prerequisites for getting Insights configured but when I attempt to load the app, I get a Page not found/404 error.
I have Portal 10.5.1 set up with a federated 10.5.1 ArcGIS server running on an SSL domain certificate control internal virtual machine. I have the ArcGIS datastore installed and configured and the local machine validated as the hosting server. I have the webadaptor installed and configured to the local machine. I installed Insights without a problem and configured and licensed it via Portal.
The Apps cluster shows up as expected next to my username in Portal and Insights appears to be available but it only loads a 'Page Not Found' error page. I've checked logs with no usable messages.