UE5 Audiolink and Wwise spatialisation - obstruction/occlusion not working as expected

I’ve posted this on the Audiokinect forum also but figuring this might be a place for answers also. I’m on 2023.1/5.3. I can get spatialisation working but I get no obstruction. I’ve played around with most of the settings in the UE attenuation file and I’ve unchecked the base soundmix so there’s only sound from Wwise. The “Adventures…” blog post mentions that some features for this aren’t implemented yet and I can’t find any confirmation that this has or has not been implemented. Any advice is most helpful.

Best

Johan