Check-in time came and allowed me to do it for both flights, howewer, after it was done I have received no bp and it just shows on the app that I can now do check-in. Which I already did and when I press that again it shows that it was done. But no bp for either flights on the app nor have I received anything in email. Guess I'll call cs although I don't know if there's much they can do.

Edit: cs informed me that even though I have submitted passport details online I will need to present my passport at check-in desk at ARN. I believe "random check" was the word she used. Luckily I have a three-hour layover there.