I had the same issue but on the passenger’s side. Bought as a used car and even the dealership couldn’t fix it. When I removed my bumper to install some LED fogs I was able to fix it.
When I had it all apart I checked for any broken tabs on the bumper and bracket bolted to the fender. Nothing was damaged. When I put it back together, it would pop out. Every time I snapped it into place, the part under the headlight would pop out. So I held the part under the headlight in place while snapping the part where the bumper and the fender meet. It’s been over two months and so far so good.