AD imported requester Details not populatuing on new request

AD imported requester Details not populatuing on new request

I have imported the users into SDPLUS from AD
 
However I have a couple of users that although they are in the system as a requester with all thier details
 
ie:
e-mail address
telephone number
 
when i try to log a request for these few users thier details are not populated in the request details ( including thier e-mail address )
 
as such no notification are being sent to the user  
 
can you advise ?
 
 

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