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#21
I agree that it's worth re-trying with your own 21H1 Version's ISO file. Option 5 [TechBench] of the download ISO tutorial allows you to select a Version.
Download Windows 10 ISO File -TenForumsTutorials
And then run the Repair install [aka In-place upgrade] from that 21H1 ISO file
Repair Install - TenForumsTutorials
If that works then make a new system image before trying again with a current 21H2 Version ISO to get up to date.
Best of luck,
Denis