Interesting change just in the last few days? I called AFKL this afternoon to try to get WS PNRs for some upcoming trips. The guy said it should be the same, because he couldn't see a WS PNR. He said it worked on the WS website for him. Since the WS app/site historically haven't even allowed numbers (which most Amadeus PNRs and DL seem to contain), I was skeptical. But when I entered the Amadeus PNR in the app, it not only let me type in numbers, but actually brought up the booking, complete with the WS PNR.
Not sure what prompted this change on WS's end, but it's a positive development for sure
The app still doesn't recognize that check-in for the codeshare is open, but I guess we take what we can get.