Acquisition via website is not displayed

I just wanted to see how many users come to us via a foreign site that links to us. For this I used the report Websites. The page I am looking for did not appear here at all. Now I followed the way myself to see the entry in the Visitor Log. There it was indicated to me that there is a direct access.

What could be the reason? Could it be that the previous website blocked something? Or could it be because of browser settings?