sharepiont how do you add a user that is not in ad?

I am trying to add an email to a sharepoint group that is not in active directory so they can access my site externally.  It keeps giving me an error saying "No exact match was found".  

Someone has already been added to our site by someone else.  How do I do it?
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66866Connect With a Mentor Commented:
Here's a similar situation and how it can be overcomed
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