Registered just to respond to this post.

Identical situation as OP..you are not alone! Received the same error message on the award selection screen last week, and got the same runaround from Bonvoy Member Support. They created a ticket to escalate which will hopefully resolve the issue, but I intend to call back every few days to try and force a solution. Like you, I want the 85K FNA, and don't want to be stuck with the 5 NUAs given the quickly approaching selection deadline.