How can l find out why 1% of my sims aren’t happy?

@schiphol-plaza You just need to tap on each house in the region and it will tell you what the issue is that they are unhappy about.
Or you may have a request for Landmarks or Entertainment floating above the house.
Or they could be unhappy about living too close to something, like the coconut farm, in Sunny Isles or oil plant in Cactus Canyon or the Mulberry Grove in Limestone Cliffs.
They don't mind living next to the Green Factory in Green Valley, there's no issue with that.
I still don't have Frosty Fjords unlocked, despite my best efforts so I cannot comment on whatever is used there.
In my regions, the regional storage causes no issues but City Storage in the Capital freaks them out.
In a nutshell, in the regions it could be easier to find out why they are unhappy but the developers have made it the way it is.
Happy hunting 🤣

@schiphol-plaza You're welcome 😀