Thank you so much i was hoping there was some way to mitigate it. But if its needed, i will go with it!

You could extend the new porch ceiling all the way to the house and add 2-3 cut-in vents in the area of the existing house overhang. There may be some work in adding furring strips where the ceiling goes from sloped to flat at the existing overhang, but it would be worth it esthetically. If you ever enclose this screen porch, you will mess up the ventilation again and will need to reassess more venting options.

That is a great idea to pitch to my contractor.I don’t know if this makes a difference in the venting issues

but there is soffit along the outside edge of the porch and the inside that connects with the other part of the house and connecting soffit is just a short length. I just had new triple vented royal vinyl soffit installed. here are pictures.

There is no guarantee that the screen porch roof venting connects to the house attic (where venting is required). Most likely the connection point of the screen porch roof prevents air movement into the main roof. You could also have enough other venting that would be adequate if the screen porch vents were blocked off. Your climate location will also factor in the ventilation requirement.

So i guess that we will have to remove the soffit to find out if it is connected. it is very difficult to get close to it in the attic because the slope os so low. 2/12 Here are some screenshots from Hover

that indicate it might be needed.

There were soffits and vents like that on my last house. We added a sun room. (yr around type), and were told, that the soffit venting had to stay. They never bothered me at all.