Still (Sep 2017) seems to be a disconnect somewhere between Evernote for iPhone and Contacts. I've been using the Scannable -> Evernote -> Contacts route for about a year. It seems that certain business cards, no matter how often I try, will not be added to contacts even though Evernote for iPhone reports that it has. Today I tried to add a card five times, then finally used Evernote on my MacBook to try adding it from there. It worked perfectly.