Beginning with Commander 9.4.0, Snow has deprecated the built-in Join Domain workflow step in response to Microsoft hardening and deprecation of DCOM, which was used to perform this action.  To continue to accommodate customers who require a Join Domain step in their completion workflow, Snow released a module for joining a VM to a domain in the workflow process which uses WinRM.

After adding the module to the workflow, user may run into the error Computer 'MachineName' failed to join the domain 'DomainName' from its current workgroup 'WorkgroupName' with the following error message: A specified logon session does not exist. it may have already been terminated" as shown below:

The vcommander.log file will show the error as follows:

This error could be an indication that the DomainAdmin credentials created for this module are not saved in the UPN format (username@domain.com).

This can be further confirmed by examining The Event Viewer in Windows on the target VM, which will show an Event ID error 1497 that reads "The machine MachineName attempted to join the domain DomainName but failed.  The error code was 1312"

If the issue caused by an incorrect username format for the DomainAdmin credential, it can be remedied by logging into the Snow Commander admin portal and navigating to Configuration > Credentials and highlighting the DomainAdmin credential and clicking edit.

From here, modify the username to match the UPN formatting of user@domain.com, then click Ok to save.   Retrying to failed step in Commander should result in a successful joining of the domain using the Join Domain - WinRM module. 

See Also

Join Domain Guest OS Workflow Step Fails Due to Microsoft DCOM Update (snowsoftware.com)

Configuring the Join Domain Commander Workflow Module (snowsoftware.com)