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Scripting logins to each entry on the exported list, and using pssh to execute the powershell command "$env:computername" will generate a list of machines names for each successful connection. If the names are discoverable between the VPN subnet and the domain server, one command can be executed to join them all at once.
With this list (ex. - computers.txt), in Powershell run these commands:
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Alternatively, if the machine names are not discoverable, running pssh and executing the Powershell command below will join each machine to the domain as a connection is established over the FRP channel, and restart the VM:
Add-Computer –domainname "YourDomainName" -Restart
After the AD bind process is successful, end users can log in as the "User" account to connect to the corporate network, and then switch users to their domain account after the network connection is established. This will cache their credentials in the VM, so that future logins can be done offline if desired.