Artifactory - Cannot create a repository linked to a private nuget feed (grial)

We are using a nuget repository named Grial (https://docs.grialkit.com/)

In our artifactory instance, we are not able to define a remote repository linked to Grial

For instance, we can go to : host:port/artifactory/api/nuget/nuget/Packages(Id='UXDivers.Grial',Version='3.2.87') without any problem

But the download part (host:port/artifactory/api/nuget/nuget/Download/UXDivers.Grial/3.2.87) raises an 404 not implemented error :

The feed 'NuGet [https://host:port/artifactory/api/nuget/nuget/]' lists package 'UxDivers.Grial.3.2.87' but multiple attempts to download the nupkg have failed. The feed is either invalid or required packages were removed while the current operation was in progress. Verify the package exists on the feed and try again.

I think the NuGet Download Context Path is wrong in our config, but i have no idea what it should be.

Is there anyone in the community who has already experienced an issue like this with a private nuget repository ?

Thanks in advance