1. Check that the IFTTT Webhook URL is correct
Click on the action link (URL begins with https://maker.ifttt.com/trigger/....) to manually trigger the event on IFTTT. You should see a short confirmation message by IFTTT and your desired event as configured on IFTTT should happen (e.g. lights turn on, you get a message, ...).
Make sure that the displayed Maker event is correct and actually exists! IFTTT does show this message even if you mistyped the event name. There is only an error message if the authorisation key is wrong.
2. Check the Logicblock
The Logicblock page will load again but this time with an additional blue box at the top.
The blue box tells you how Apilio evaluated the Logicblock:
If the result is not what you expected: try setting the variables manually (on the variable pages) or change the conditions until you are satisfied with the result.