I have to say I'm having more and more difficulty installing these updates using VirtualBox. I've only ever been able to use VirtualBox since the Windows 10 first release of an insider build in 2015.
Since I bought a Windows 11 laptop I transferred the builds to that and have been able to use VirtualBox but not easy of late.
The latest ISO clean install insists there isn't TPM 2.0 available but it has been updating builds until now. (I had to clean install because it wouldn't update) The only way was to bypass the TPM check, which sort of defeats the object of the exercise. I think I'm going to have to give up soon but it's been interesting seeing the new features and getting a flavour of what is on the way.