They often could not see seats I could see and so on.
I've experienced this - many, many times.
You just have to callback / re-contact until you get someone who can - I did give up a few times though.
I also have a flight on Finnair in business in October - have you attempted to choose your seats as of yet?
Apparently their new policy does not allow for seat allocation (even for those who've already allocated their seats prior to the new policy) and you're instead only given the choice either at the airport or whilst on the plane, as per a few posts above / previous page.
Pretty pathetic for business class tbh (even if on a rewards booking).
BA isn't any better either (probably worse) - they want AUD$140+/pp just to allocate seating in PE!
I'm surprised though that you only paid $456 in taxes - must be due to going via India and Finland which makes the taxes lowish.
My OWA itinerary is as per below, and it was 318k pts + $1.1k taxes/pp.
Melbourne > HK (QF Business)
HK > Paris via Helsinki (AY Business)
Barcelona > London Heathrow (BA "Business" - intentional inverted commas for Euro "business")
London Heathrow > Singapore (BA Premium Economy)
Singapore > Melbourne (QF Business)
For the London to Singapore flight, I couldn't find any business reward seats at the time of booking, and nothing either since.
A bit unfortunate, because the entire itinerary has been calculated up due to the rest of the trip being in business.
Probably a very low chance, but I've still kept looking on a daily basis - not even economy reward seats are showing on the day I need.
Ruling out EK completely despite them having some reward seats though (ie. searching London > Dubai, then Dubai > Singapore - some options come up), due to the ridiculous taxes they charge (more than the entire itinerary above!) and also not being under the OWA cap.
Also not prepared to transit in such places like Amman or Delhi just to gain business class either - I'm travelling with my partner and she insisted that there be as little transits as possible, even if in business. She wanted a CX flight from HK to Paris but unfortunately only AY came up as an option at the time, and also no alternatives since.
Even if I was travelling alone, I still wouldn't be prepared to transit via India / the Middle East either just for business class.
I know some people go out of the way (literally) just because there's business seats available, unfortunately I'm not one of them.