Hi,
I noticed since crazy AY introduced their Business Light fares, it is not possible anymore in such situation, BA # or ticket but AY operated to select seats on the Finnair website I have tried both ways, trying when the BA websites links to the AY site or entering the PNR on the Finnnair site - under both situation I get "Sorry you can't select your seats here, please call our Customer Service".
I have called Finnair customer service once for this and crazily I keep getting a pushback from them, that because it's BA ticket and number they can't do this, etc...I requested for this to be escalated to their supervisor, but never managed to finish my call as it was cut off - wasted 45 mins of my life due to holding and getting an (in)competent agent (?)
I don't know. Previously it was never an issue before they introduced their silly new fare categories.
Will be curious if others have an alternative without the need to call AY.
Cheers!