After OSX 10.11.6 and Server 5.1.7 Update No Longer Can Enroll Devices

Last Friday I updated my iMac running Profile Manager to OSX 10.11.6 and Server 5.1.7. I am no longer able to enroll DEP devices into MDM (Profile Manager). The credentials for the local admin user that I used successfully in the past is no longer being accepted by Profile Manager. I am able to log in using those credentials to both the Desktop as well as the Profile Manager website. I can see the rejection of the username/password in the Device Server Logs. Has anyone seen this since the update? This is holding up rolling devices out into the field. Thanks!