Thanks so much for the reply! I have asked my dealer but honestly they are totally useless and just ignore me. I also mailed Mini concierge who said 'At this time, I am researching your concerns regarding Amazon Alexa integration. I appreciate your patience.' That article you linked to is from late 2018 though, so you'd think they might have made some progress by now.
Seems so weird that they ship a feature which apparently simply doesn't work!