Deleted users in Encryption Server cannot be enroll again?

Hello everyone

I have a problem that when i delete a user in the Encrytion Server 10.3, that user will never able to enroll again with the server. For more detail, i'm only use Encryption Desktop managed by an Encryption Server, no other features is enable. A user1 was enrolled successfully and i accidentally deleted user1 account. When he log on again, the enroll wizard ask him to provide his password but it return error -11286.

I have import the user by his key to the server, the server accept the key but user1 still unable to enroll again.

Any solution for me? Very appreciated.