This does sound a little like the challenges many had with Flying Blue when they went super aggressive in fraud detection. In that case and I assume here, it was largely a problem for those that never flew AF or KLM or a partner. With Flying Blue they were freezing a reservation (in some cases cancelling) at time of booking and directing customers to visit a ticket desk. Those impacted in this case were UR point users who never flew Flying Blue partners and then ran into challenges.

That said I did recently book 5 tickets with AS miles on FI for myself and extended family. No problems. But all miles were earned on AS and I’m MVPG.