I've followed https://docs.safe.com/fme/html/FME_Server_Documentation/Content/AdminGuide/configuring_for_https.htm#EnableSSLWebSocketServer
for HTTPS, service URLs changed etc.
When trying to create a websocket subscription under Notifications I get an error of "There was a problem communicating with the REST API" when I click validate
FME seems to be running fine and I can query the REST API ok.
Any ideas?