Trouble with lighting the leaves of a tree

Hi all,

I new to the forum and unreal. I have a rendering background (Corona) but I want to get into realtime.
For my first scene I used datasmith to create a scene with a simple building and a few trees.
I followed the arch viz tutorials on unreal academy until I ran into some problems.

I’m having a lot of problems in lightbaking this tree I created. The tree is exported from TreeIt.
I’ve imported it as an FBX, unreal did the lightmap generation. I regenerated them for the leaves planes
to be 1024 in resolution.

Now when I build the lighting the leaves become realy dark and I just can’t figure out how to fix this.

The lighting I’m using is the default scene lighting. Lightmass settings are all standard.
I checked the Use Two sided lighting checkbox on the leaves mesh object.
The leaves have a Megascans atlas material on it, two sided overide is checked.

Can anyone help me with this? I think I’m missing something simple but I don’t know what.

Attached you’ll find lots of images.

Thanks in advance.