When I exported my identity then tried to import it on my other Mac the import window would not let me import my key. I determined after opening the key in a text editor that it requires the extension to be .ini. Now if this is the case it seems like there is a bug in the export where its not adding the extension or at least giving the option. Many mac based apps have this built in with a checkbox for "add extension"

In case anyone else has this problem just save it with a .ini at the end.