Visual Studio do not loads Unity symbols from symbolserver.unity3d.com

There is a game that crashes. I connect to it through Visual Studio 2019 JIT debugger. I see stack trace, but I don’t see function names. I need to download symbols for Unity. I do not have Unity installed.

Following the instructions from the Unity portal, I added the http://symbolserver.unity3d.com/ server where Microsoft servers are already added by default.

When I start debugging the game, the symbols for Windows dlls are loaded perfectly and I can see the log of loading these symbols. Symbols for Unity libraries are not loaded at all. And the log is empty. That is, the feeling that they do not even try to load.

What could be the problem? Why symbols for Unity are not loaded?