Twinmotion-Beginner: How to avoid Flickering in Animations and how to turn on Emissive Materials? (Pathtracer)

I heard, that twinmotion does not render with denoiser in an animation (with pathtracer). So it is needed to render animations with Lumen.
I did that. But now I have a lot of artefacts in the interior on the floor. I tried a lot of settings, but I could not get rid of the artifacts :expressionless:
I made a shot video: