Perhaps all the vertices between the surfaces aren't shared? Try this:
1. Make sure all surfaces to be smoothed together are in the same object. (Object -> Merge if not)
2. Select the object, go into Vertex mode, then perform a "Vertex | Snap together by distance..." --- give the distance there some small number, like 0.0005.
3. Back in Object mode, perform an Object -> optimize vertices.
This will remove vertices that are in virtually the same place but not shared between surfaces.
hope that helps
Dennis
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