My apologies, I had assumed you booked tickets to attend a funeral, which is why the timeline was confusing me. In any case, my condolences.

so you booked two separate one-way award flights, one of which was not ticketed it seems. My only suggestion is to resolve this on the phone to KLM. I don’t know whether you will be successful in getting that award pricing as there may not be award space left, and I don’t think they will force space for you.