Hi Ben,
Thanks for your post. As a general guidance you should start with the Hyper-V-VMMS and Hyper-V-Worker event channels when analyzing a failure. For migration-related events it makes sense to look at the event logs both on the source and destination node. Below are the current event log channels for Hyper-V. Using "Event Viewer" you can find them under "Applications and Services Logs", "Microsoft", "Windows". If you would like to collect events from these channels and consolidate them into a single file, we've published a HyperVLogs PowerShell module to help.
You can see the following article for the detailed Hyper-V logs description: Looking at the Hyper-V Event Log (January 2018 edition) - Microsoft Community Hub
Best Regards,
Ian Xue
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