When joining with a "normal" Domain-Admin User the Join may fail due to the User is not member of the group 'DC Backup Slaves'. In that case the log does NOT contain any hint but instead prints out 'successfully joined'. However the client object is not created - this also is not visible in the server side logs. The Domain-Join-Script should check if the used Join-User has sufficient rights.
"DC Backup Hosts"
This issue has been filed against UCS 4.4. UCS 4.4 is out of general maintenance and components may have vastly changed in later releases. Thus, this issue is now being closed. If this issue still occurs in newer versions, please use "Clone this bug" or reopen this issue. In this case please provide detailed information on how this issue is affecting you.