@rtjdamen Bingo!
A friend of mine suggested the same, tried to first do an online repair on my Hyper-V host.
When that failed, I finally tried it in XCP-NG and loaded the Windows disk, started the repair and that solved it!
D
Best posts made by DonZalmrol
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RE: Solved - Migrating from Hyper-V to XCP-NG and guests not booting their VHDsposted in Migrate to XCP-ng