As the GP comment form says, “Your first comment is held for moderation”. It means that when the system thinks you might be new, it doesn’t publish your comment until a person (administrator) has come and looked it over. And sometimes, it can take a few hours (or days) to get around to it. The point is, it’s nothing against you. After your first one is approved, it should get easier for you to comment.
It should also be noted that if you use a new device, you will find the site asking for your name and email again.