They are living animals. We can't make them do anything but we can sometimes influence them. I've also had problems with that before. In spite of everything some just decide to not lay in the nest. Or even after they have been laying in a nest they decide to change. That can get really frustrating.
Some pullets seem to have control over the laying process from the get-go. About a week before they start laying they look for a good nesting site. Occasionally a rooster will help them in that search. They try out various places and when they lay that first egg they know where they are going. Others don't have that control. They may drop their first eggs wherever they happen to be, from the roosts or just walking around. But they normally gain that control pretty quickly and decide where they want to lay that egg.
I'm a firm believer that fake eggs can help a lot. It does not always work, remember they are living animals, but many pullets and hens like to lay where others are laying. Fake or real eggs can influence them to lay there. I have fewer problems with pullets not laying in the nests when I have others already laying in nests.
For some reason those two pullets decided that those corners were the best places to lay. Who knows why? Interesting they chose different corners. It could be that they don't like darker places. Maybe shadows made it look hidden. It is possible one dropped an egg there accidentally and decided since an egg was there it was a good place to lay. Did you keep the eggs cleaned up or leave them laying? Were those real nests open a week before they started to lay so they could check them out?
Regardless of why they are laying there, if they consistently lay there then those are where they have decided to lay. Hopefully you are collecting the eggs daily and not encouraging them to continue to lay there. I've never had success blocking the nest area, they just lay next to whatever I put there. Maybe someone else has had success. Still, it is one of the easiest things to try. It's worth a shot.
I made a couple of my nests so I could lock a chicken in them if I wished. It's come in handy for different reasons, this being one. When I have a hen or pullet laying somewhere other than the nests I catch them on their nest laying and lock them in a real nest until they lay that egg. Sometimes I can just pick them up, sometimes I have to chase them down with a fishing net. I lock the pop door before I start. I leave them locked in that nest until they lay an egg. Usually that takes about a half hour though I had one hen go 3 hours. Usually it only takes doing that once and she gets the message though I had to do that 3 hour hen twice. The challenge is catching them on the nest to start with. I'm retired so I can check often. Others may find that challenging.
I've never used this method but some people claim success. Put a temporary nest where they are laying, maybe just a cardboard box or a nest with a top. Use bedding and a fake egg. After they are used to laying in that box, gradually move it toward your real nests. Maybe a foot at most every three days. Hopefully she will follow that nest. When you get her to the area of your real nests take the temporary one away and see if she moves to your real nest. Or maybe you can move her to an acceptable location. Or if it is convenient, make a permanent nest in that corner. Mine always choose a spot where I would have to crawl in the chicken poop so that is not acceptable to me.
It can be a frustrating problem, many of us have been through it. Good luck!