Users are not able to enroll.
No Error. It will return you back to the enrollment page for the user to enter his credentials to enroll.
Having multiple LDAP Directories configured under Directory synchronization can cause this issue.
Go to Consumer tab and under Directory Synchronization tab.
Choose the LDAP Directories section and set the priority of the directory of the user using the drop down menu to 1.
Please see the screenshot below for more details : -
PGP Desktop Client 10.3.1
Symantec Encryption Server 3.3.1