Export issue from 3dsmax 2021 / Glossy and reflective buildings

Hello Everyone,

I’m experiencing an issue exporting my scene from 3dsmax 2021. Export is fine (no errors) but the buildings I created display as glossy and a little reflective in the sim. Regardless the flightsim material I use, even standard, even if I change roughness and metallic. Is anyone experiencing the same issue?
Something I missed in the export process? When modeling?
Thanks a lot
Best regards,
Christophe.

I‘m not a 3dsmax user, but check this link:
https://forums.flightsimulator.com/t/sdk-and-3ds-max-2021-a-plugin-is-planned/245514/7

Thanks a lot CursingBroom74 but I couldn’t find something relevant in this post.
I have no problem with installing the SDK nor the Max plugin
I am able to export perfectly meshes and textures in the game but I can’t find a way to get rid off those reflective meshes in the game.
I thought it could be related to Max 2021
So far, no clues…
Regards
Christophe