I am trying to register KLM flights. I flew TRD-AMS-UIO in class L and N and then the reverse 11 days later. After giving up registering my EB# with KLM, I was tipped about adding it in the SAS app using the booking code. That worked, and the day after arrival I got a notification about new points. But this did not happen on the return. I don't know if that has anything to do with the first flight being delayed so that I was rebooked for the second leg. Now it's been 9 days and I try to register, SAS says the chosen airline could not process my registration.

I'm confused about the class, I first entered M as that's what the boarding pass says, but the booking confirmation says L for TRD-AMS and N for AMS-UIO (both ways). I tried both variants to no avail. Based on the most recent post here, maybe I should just try again later.

I got 200 points for TRD-AMS and 1484 for AMS-UIO which is actually more than I had expected.