Thanks for reaching out. Let's sort this out.
A few questions: what's the make and model of your PC? What Operating System (OS) do you use? Is the Google Chrome browser version updated? Did this previously work or did the issue begin recently?
Give these steps a try:
Let me know how it goes.
Thanks for keeping us in the loop. It could be with the device. Its system or settings might be preventing the casting from Chrome when not in the tray but, glad to hear that it is working now.
Let us know if you have other questions and concerns otherwise, we'll be locking this thread after 24 hours.