Originally Posted by irishguy28

I just went and had a look at the same reservation on the Air France website, and my FB number does not show up there. (It says: "Frequent Flyer number: not specified"). Adding it (again) on the AF website gives me the same result as what you have experienced - it appears to go through, then when you go back to look at the reservation, it's still "Frequent Flyer number: not specified".

Originally Posted by irishguy28

In your case, I would advise you to look at the reservation via KLM. You will probably see that the number is already in there. If not, add it there, on the KLM website.

It's strange that the AF site would show 2 out of 3 numbers on a single booking as having been added, but then handles the third differently. But my guess is that, even though the AF website says your number hasn't been added, that it actually has, and that it will grant you whatever status benefits you may have despite not showing your number.

If the Flying Blue number is successfully added at any point prior to checkin - up to and including during OLCI - then the boarding pass will be generated with the number, and correct status.