Thank you for posting the question in the support community. When you get a chance, could you reply with a copy of the current configuration (Please, remember to remove any information that may be sensitive to the organization)?
Also, here is a post on configuring a DHCP pool for a specific host (for reference): https://supportforums.adtran.com/message/1762#1762
Please, do not hesitate to reply with any additional questions or information. I will be happy to help in any way I can.
I went ahead and flagged this post as "Assumed Answered". If any of the responses on this thread assisted you, please mark them as Correct or Helpful as the case may be with the applicable buttons. This will make them visible and help other members of the community find solutions more easily. If you have any additional information on this that others may benefit from, please come back to this post to provide an update. If you still need assistance, we would be more than happy to continue working with you on this - just let us know in a reply.