Within the XenMobile console, under the user column, few users started showning as anonymous. 

In zdm.logs we might see: User 'firstname.lastname@domain.com' not found or is disabled. Switching to anonymous mode  

Check the following steps to troubleshoot this issue:

1. Identify within Active Directory if the impacted user falls under any of the following categories:
   • Active Directory user is disabled.
   • Active Directory user is deleted.
   • Active Directory user moved from one OU to another.
   • Active Directory user UPN and /or SAMaccountName changed.
2. Verify if the service account has lost its permissions.
3. Verify if the number of devices per user has reached.
4. If the Active Directory admin has changed SAM (or UPN) from firstinitial.last (or firstinitial.last @domain.com) to first.last (or first.last@domain.com) this can cause the enrolled devices to be un-authenticated and will show as anonymous.

Problem Cause