I'm using IFTTT to activate scene when my phone is connected to a specific Wi-Fi. It works, but there is an annoying delay (about 30/40 secs), so it's useless for what I need to do. I don't know why.
BTW, Just try to start from scratch, creating your own applet. Aftet that, go to Activity tab and then check the log. If still fails, in the Errors section there should be something like "Applet skipped" with the reason.