It depends on whether the occluded fitting is necessary to have your HAs work more effectively or not. If yes, then there’s not much you can do but get used to it. And while this is very annoying, people have learn to get used to it or at least live with it.
Talk with your HIS/audi. If they think you can be fitted with a more open/vented fitting and still have your HAs work effectively, then a more open/vented fitting will help reduce the occlusion effect.