Flying many times from AMS, we have never been able to use OLCI, always have to go to the KLM Skypriority check-in counter (mercifully there is hardly ever a significant wait, unlike the regular check-in line). To our surprise, last week when flying back via Paris on AF we were able to use OLCI via the AF website, with our electronic boarding passes emailed to us, just had to get GC numbers entered at the gate for transcon flight at CDG.