The phrase "at the instance of" is the correct one to use in this context. Here's an explanation of why this is the case: Meaning of "Instance" In English, the word "instance" can refer to an event or occasion. When used in expressions like "at the instance of," it conveys the idea that something is happening because of a specific request, action, or decision made by someone. It suggests that the event is taking place due to that person's influence or initiation.