Hi ,
Is this with using the Path Tracer or the regular raster engine? Do you have the video to share as an example?
You can share it privately using the 'Contact Us' functionality: https://twinmotionhelp.epicgames.com/s/case-community-page
If you are using the Path Tracer, increasing the number of Samples Per Pixel usually leads to less noise, although this increases render times proportionally. You can also turn of the denoiser.
Here is a good video explaining the settings for Path Tracer: https://www.youtube.com/watch?v=XlFQ2HbiGvY
Cheers,
Francesco