Followers won't enter the cave because you probably haven't navmeshed it. If you have, thenI'm not sure though it probably has something to do with missing markers or improper navmeshing. I don't have much experience building dungeons or homes, so I'm not 100% sure what the cause of your problem might be, though if you haven't navmeshed it it's definitely that.
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Anyway, navmesh might be the problem, like the first poster said.
ive navmeshed it but i did it by hand so i might have done something wrong, it seems straight forward tho..