Both AudioClose3D and AudioClosest3D are valid datablocks. Did you try just using AudioClose3D and seeing if it works? Clearly that isn't a permanent solution but at least it could help us identify the problem.
After changing all the references of the AudioDescription to AudioClose3D, players spawned in my server 100% fine, before, the entire process of downloading datablocks would stop for them.
Something is wrong with the description, I've tried copying values from an existing, working datablock into it, removing the parent, and changing the preload on the boltout sound to true.