Problem: A workstation that has been successfully cutover no longer responds to any additional jobs, such as Cleanup.
Solution: If a workstation that has been successfully cutover now fails to respond to any additional jobs, such as Cleanup, check the Application event log. If you see a "The remote name could not be resolved" error, this most likely means that the SRV record for the Migration for Active Directory Express Server can no longer be resolved due to a DNS lookup failure.
If you cannot "Ping" the Migration for Active Directory Express server from any other machines in the target domain, then you will need to remedy this on a more global scale, such as creating a conditional forwarder on the target machines' current DNS server pointing to the appropriate location.
If you are able to "Ping" the Migration for Active Directory Express server, then check the Network Profile that was used during the Cutover to verify that the DNS settings were correct in that profile.