Attaching a VHDX file
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@Dan-Wages , I hope all is well. Depending on exactly where you are in the process, and what you have done/want to do, the following should be helpful to show you what to do, and what order to do it in:
https://www.altaro.com/hyper-v/hyper-v-attach-existing-virtual-disk/
Good Luck !!!
Cheers,
Adam