Skype for Business users have wrong name

We subscribe to exchange365 for email.  we also use skype for business.  I have 2 skype for business users who appear to other users as wrong users.  for example, user1 logs in as herself to skype for business, but to me she appears as a user who was deleted a year ago.   another user2 appears to me as user1!   Crazy!  
Is there  a local file to delete or something?

thanks!
roujeskyAsked:
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Jian An LimConnect With a Mentor Solutions ArchitectCommented:
you can try to run thhttps://kb.intermedia.net/article/3238 for end user, but i am not sure whether is it a end client user issues or configuration issues.
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