The answer lies in your question already…
When you use get_permalink for your post 171, it gets you
https://mysite/2018/11/24/152-revision-v1
So, as you can see, this post is not a published post, but a revision of a post. Revisions are not public, so you can’t see them…
So how to solve that?
You’ll have to check the correct ID of a post you want to link to and replace 171 with that ID.