Many thanks Darthviper107, but unfortunately it seems like the project settings are correct, based on the documentation page of ue5.1, however i took a screenshot of my project settings and the lumen scene resulting. Still the issue is present.
A thing i maybe better specify is that this noise is not static, is changing constantly and it behaves like a video noise from cheap cameras when the scene is dark.
Also this room has almost all indirect light
Another thing, i also have a huge amount of reflection noise on metallic surfaces, basically all from the skylight. Maybe the issues are related