Ok, we need more details, because Vue's AA is alright. What is the size of the render? What kind of atmoshpere are you using? (volumetric/standard)

What lighting model? (standard/ga/gi/gr)

I see a volumetric spotlight, which may be the cause of the artifacts you are seeing. In my eyes, this is not an AA problem, but a volumetric light problem.

Volumetrics tend to be more grainy than non volumetrics ( lights & atmospheres), you need to boost the volumetrcis quality to at least 2. For atmospheres, it's in the fog & haze tab of the atmosphere editor. For lights, right clik the volumetric icon and choose edit volumetric settings, and boost the quality there.

One lore thing: are your walls boleans? If so, there isn't much to do about it, boolean operations always have artifacts, even in the best 3D apps, it's a geometry problem.

As for AA settings, you need around 12 subpixel samples, standard quality.

If you use a preset render quality, don't choose final, not enough, but don't choose ultra either, too long to render, and settings way too high.