Why were the results of the Viking voyages and the discovery of Greenland

Why were the results of the Viking voyages and the discovery of Greenland and the Vinland country for a long time unknown to European scientists?

One of the main reasons for this was the fact that after the Vikings visited this region, they did not plot the territory they discovered on the maps and did not notify any of the Europeans about it.
At the time of the first visit to this land by the Vikings, the rest of the world was not interested in the development of new lands, since then the existing ones had not yet been explored.
In addition, at that time, these territories did not carry any function, since they were in a harsh and cold climate, where a small number of local fishermen of indigenous people lived.