Check these things:
Have you actually set up a waiting room, and is it covering the URLs you are testing and the current date-range?
Is your chosen integration installed and working?
Is your rate set low enough that the waiting room will actually engage at the moment? If you want to be certain of seeing a waiting room, set the rate to 0.
Have you already been promoted without realising it? CrowdHandler makes every effort not to put users back in a waiting room if they’ve already been approved. If you’ve been clicking around your site with a high rate, you will have been promoted without even seeing a waiting room, and your device is already marked. Try visiting with a new browser or an anonymous tab.
Often, when users get in touch about this issue it’s a combination of 3 and 4.