Spatializer sound doesn't work

Audio source failed to initialize audio spatializer. Please check that the project audio settings and make sure that the selected spatializer is compatible with the target.
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

Hola! I have all the proper settings for my spatial audio, but I still get this message, and the weird thing, is that some audio sources actually are spatialized in my scene, others don't work...

This should be such easything! Any recommendations? Using Unity 6 and Meta sdk 72

I already went through the documentation... 😕

Thanks in advance