I’ve tried to install some machines on my Hyper-V. All ISOs were placed on the second drive where data deduplication is enabled. With deduplication enabled I ran into the problem that no serial/license number was accepted neither the AVMA Key nor the generic KMS Key or my own key. After hours of searching for solutions on the web and no solution in sight. I copied the iso to drive D again. Suprise it was working! One day later I tried to install a new machine and it wasn’t working again. No key accepted. After moving it to drive C where no deduplication happens its working again.
Conclusion: Never ever put windows installation media on a drive with data deduplication enabled.
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