Advanced Custom Fields Custom Post Types Heirarchy

In case you haven’t resolved this on your own yet, I just experienced this exact same issue, and realized the solution is that I had not enabled Page Attributes for my custom post type. In this case, I’m working with a custom post type called “Industries.” So, first I went into the ACF Custom Posts menu, and on the edit page for my ‘industry’ post type, under the Advanced Settings section, General tab, check the box next to “Page Attributes” as shown here:

screenshot of the backend of ACF's Custom Post Type > Advanced Settings > General Tab

This will then display the Page Attributes box, which contains the parent page select dropdown field, in the right sidebar of your individual custom posts of this type, as shown here:

Screenshot of the Page Attributes box in the backend of an ACF custom post

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