GPU VRAM Lightmap Issue

So im getting this error with unity, (for reference i have an RTX 4090. 24GB VRAM. everytime i bake my lightmaps. it falls back to the cpu baker. now i notice when baking lightmaps. unity uses. 0% of my gpu. i monitor it, and even if i force it to use my gpu through windows settings or the nvidia control panel. my gpu idles on unity. idk if this is a gpu issue or not but i cannot bake lightmaps with my gpu because of it.
i should also mention that it tells me i only have 400 mb’s of ram avaliable to unity i suppose. so its not using all of my vram for whatever reason. and also my gpu gets used on anything else just idles on unity, ive closed everything out, ive restarted, ive factory reset, idk whats going on

Create a blank project and lightmap in there. Does it use the GPU? If so something causes the lightmapping not to work in your current project. To figure that out more info is needed.

You did set the lightmap baking to run on the GPU? It’s not the default I believe.

What exactly are you “forcing” in there? Neither windows nor driver provide Unity-aware lightmapping settings.