Interesting check-in experience a couple of days ago. After looking at expertflyer I noticed that there was one set of three seats (short-haul flight) free so I decided to change my seat when checking in using the app. But the app showed that all the seats were taken. Then I browsed Finnair.com and the change was possible. Back to app and check-in was possible and the new seat was assigned. However, the app stated that mobile boarding pass was not allowed on my flight (it has been possible before). Back to Finnair.com and I could save my boarding pass in the Apple Wallet but only after skipping the Covid vaccination certificate (which I have but the last vaccination was 12 months ago). The fare was Business light, status OWE.