LDAP password change not working for one user

My Groupwise 2018 (18.0.2) system is tied into eDirectory. I have one user, who everytime they try to change their password (client or webaccess) gets the message:

[D06B] LDAP password change failed. Contact your system administrator.

This works fine for seemingly every other user. Any thoughts?

In the POA log I see:

12:01:08 BE7A SOAP Error: LDAP failure detected [D06B] [modifyPasswordRequest] (user)