Pass unknown generic parameter

I have a method that iterates through an object's properties and sets the values to their type's default values. Some properties are enums. I have another function that gets the default value of the enum (not 0), but it requires passing the enum type which is not known in the current method.

[DefaultValue(Red)]
public enum Colors
{
    Red = 1,
    green = 2
}

// In another class
public static TEnum GetDefaultValue<TEnum>() where TEnum : struct
{
    Type t = typeof(TEnum);
    DefaultValueAttribute[] attributes = (DefaultValueAttribute[])t.GetCustomAttributes(typeof(DefaultValueAttribute), false);
    if (attributes != null && attributes.Length > 0)
    {
    return (TEnum)attributes[0].Value;
    }
    else
    {
    return default(TEnum);
    }
}


public static void ClearObject<T>(object obj)
{
    obj = (T)obj;

    PropertyInfo[] props = obj.GetType().GetProperties();

    string propName = "";

    try
    {
    foreach (PropertyInfo pi in props)
    {
        propName = pi.Name;

        Type t = Nullable.GetUnderlyingType(pi.PropertyType) ?? pi.PropertyType;
        if (t.IsEnum)
        {
        //  This works
        //  var val = EnumFunctions.GetDefaultValue<Colors>();
        var val = EnumFunctions.GetDefaultValue<t>();
        pi.SetValue(obj, val);
        }
        // In case of nullable value types int,datetime, etc - set null  
        else if (Nullable.GetUnderlyingType(pi.PropertyType) != null)
        pi.SetValue(obj, null);
        else
        pi.SetValue(obj, null, null);
    }
    }
    catch (Exception e)
    {
    string msg = $"Error for {propName}: {e.Message}";
    throw new Exception(msg);
    }
}

I've tried typeof(t), t.GetType().

I want the default value for a Colors enum property to be Red. The line causing the error is var val = EnumFunctions.GetDefaultValue(); Error CS0118 't' is a variable but is used like a type