❔ Why can i not override a Method from a class that extend a Interface

public interface IRegistry {
    
    public static readonly List<IRegistry> RegistryTypes = new();

    public virtual void Initialize(ContentManager content) {
        
    }

    public virtual void FixedUpdate() {
        
    }

    public virtual void Draw() {
        
    }
}

public abstract class Registry : IRegistry {

    protected T Register<T, B>(string name, Dictionary<string, B> registryList, T type) where T : B {
        registryList.Add(name, type);
        
        return type;
    }
    
    protected T RegisterLoad<T>(string name, Dictionary<string, T> registryList, ContentManager content, string path) {
        T type = content.Load<T>(path);
        registryList.Add(name, type);

        return type;
    }
}

public class ClientFontRegistry : Registry {
    
    // REGISTRY LIST
    public static readonly Dictionary<string, Font> Fonts = new();

    // REGISTRIES
    public static Font Fontoe { get; private set; }
    
    
    public void Initialize(ContentManager content) {
        Fontoe = this.RegisterLoad("fontoe", Fonts, content, "font/fontoe.ttf");
    }
}