at (one's) suggestion
Because one has proposed or suggested something. I went to that restaurant at Cathy's suggestion, but I wasn't impressed with it.
on (one's) suggestion
Because one has proposed or suggested something. I went to that restaurant on Cathy's suggestion, but I wasn't impressed with it.
at/on somebody’s sugˈgestion
because somebody suggested it: At his suggestion, I bought the more expensive printer.