Bootcamp: Windows 10 iso error
I had this problem loading the Windows 10 iso from the file supplied on the Microsoft site. After a lot of support calls with Apple and Microsoft it turns out that the latest Windows 10 iso is corrupt so they (MS) gave me an older version which I installed and works fine.
So if you are having same problem, here is the file they gave me: Version 1909: https://software-download.microsoft.com/db/Win10_1909_EnglishInternational_x64.iso?t=41a7f851-5908-4cd3-a24f-f81cbc923d40&e=1603235270&h=f5f984f42b3995f4c11a68f73ea212fb
Good luck!
MacBook Pro 15″, macOS 10.15