cannot create a request for this user

cannot create a request for this user

Hi,
 
Getting an error on a couple of requestor's when entering a call for them:
 
Error: You cannot create a request fo this user. The user belongs to a site for which you do not have access to.
 
Have check everything and have access to site.  However when i look at technician screen and sites associate with them i can't see the other site's only the not associated to any site.
 
Any idea's on what to do.
 
Thanks
Keith

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