Nintex Assignees list reverting to objectSID

Hi All,


Relatively new to this, so please be gentle. 


I have an issue where a Nintex flow is pulling back a users objectSID instead of their e-mail address in the assignees list. I have seen one other post that describes the issue exactly, but this simply says they spoke to an exchange administrator to resolve the issue. However our administrator doesn't know anything about it, so needless to say, we are somewhat stumped. 


Yesterday we found that these users e-maisl weren't displayed at all, so the msexchangemastersid was added which resolved the issue. However when entering their e-mail it is found and displays as it should. As soon as you save the objectsid is displayed and no mail is sent?. Any suggestions, or help would be appreciated. 

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