Hi there,
Basic troubleshooting checklist
-Check whether the hosts are at the same level of patching and whether they can update to the latest rollup.
-Update the BIOS, firmware, and third-party drivers.
-Check whether the virtual machines have the latest matching integration services.
-Check whether the migration is authorized on each side.
-Check whether the protocol used is identical on each side.
-Check whether the TCP Port 6600 and 3343 (for clustering) are listening on both sides.
The below thread discusses the same issue and you can try out some troubleshooting steps from this and see if that helps you to sort the Issue. https :// social.technet.microsoft.com/Forums/Lync/en-US/4a5814e4-5579-4c51-954a-cf56fc05331c/hyperv-2012-live-migration-fails-with-event-id-21502?forum=winserverhyperv
Troubleshoot live migration issues https :// learn.microsoft.com/en-us/troubleshoot/windows-server/virtualization/troubleshoot-live-migration-issues
-------------------------------------------------------------------------------------------------------------------------
--If the reply is helpful, please Upvote and Accept it as an answer–