Serializing a Complex Type with IDictionary

Question

I Have this type to serialize to JSON:

public class JsonReturn<TEntity, TSource>
{
    public ICollection<TEntity> Success { get; set; }
        
    public IDictionary<TEntity, IEnumerable<string>> Errors { get; set; }
}

And It works with Success property, but Errors have failed.

I've read in the Json.Net reference that IDictionaries has its keys serialized using ToString, which results in a NameSpace description...

So, how can I properly serialize the Key and the value of my dictionary?