Solution I use:
- Make a copy of your 1st DVD in an ISO file, with engraving software,
- then “mount” it into the Windows 10 Explorer (make a right click with the mouse and Mount).
FS should load normally without needing your DVD.
Fs2020_CD1|675x163
That said I agree, Microsoft could have avoided this, especially since the license code is attached to your Microsoft account.
Good flight!