Getting Seams on Modular Walls

I am having a problem with seams appearing in my modular walls. Notice the seams on the door walls as well as the regular ones in the back of this screenshot.

So far, I have:

-world settings > changed the indirect lighting quality to 2, then 4

-world settings > changed the indirect lighting smoothness to .6, then .75

-world settings > changed the static lighting level scale to .1… here, building gets stuck at 15% and will not move forward

-made sure the lightmap resolutions are neon green in the lightmap density viewer

-ensured there is padding in between shells in the UV Editor (using maya)

What else can I try?

The issue is fully covered here.

Thank you for the reference. Unfortunately, that is one of the threads I went through before posting this. Hence the reason I decided to list everything I’ve already tried; everything in my initial post is all mentioned in the thread you’ve linked me to, yet nothing has worked for me. In addition to what I have originally posted I have also:

snapped the vertices of the lightmap UVs to the grid via Maya

allowed Unreal to generate lightmap UVs… those didn’t work either, so I switched back to mine

changed the environment color to dark grey

turned off the bloom in post process volume

played with and ended up turning off ambient occlusion in post process volume

I don’t know what else to try. Any ideas?