The magnifying glass search field is disabled when trying to use keyword(s) for searching within a youtube channel. Have tried on both Google Chrome and Microsoft Edge, nothing happens when clicking on icon.
Yes... I'm experiencing that issue again, this morning! It was working again for me, until today. You can report an issue on YouTube... click on your avatar (user pic) up in the top left corner of the page, then click "Send Feedback" in the drop-down menu, and report the issue! The more of us who do this, the better... although YouTube are probably aware this is happening again, and hopefully, they're working on it!