User name not populate while single user provisioning

Hi Team,

One of the user is unable to access his mail which are archive to EV, and when checked the database in EV I could find the user permission are lost.

I had added the permission to the datbase and i was trying to provision the single mail box, i will trying to select the user from the list, but could not find the user name.

EV is attched to Domino.