Major Problem?

About four months ago we made an investment in a catgenie. All three of our cats have been using it fine up until about a month ago when my one year old persian just decided to stop using it. We decided to try to "retrain" her by putting a regular litter box next to it and not clean it out (which is what cat genie told us to do in the acclimation guide). She won't even use the regular one. So now we're in lockdown mode. All three cats are locked in the bathroom/laundry room area where the litterbox/catgenie is. Does anyone have any suggestions?