Hi, @Jeremy Runkles
Thank you for posting in Microsoft Q&A forum.
The CNAME loop error is a generic error, in order to find out what is going on, check the log file for the task sequence. That is in C:\Windows\Temp\DeploymentLogs and you may find the root cause.
You may read this thread for the reference:
https://community.spiceworks.com/topic/1800431-mdt-2013-update-2-standard-client-replace-task-sequence-cname-loopback-error
(Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.)
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.