I have the same frustration. We use VMs to do integration testing with our software which has an Endpoint Security System Extension. VMs are perfect for testing this as we can quickly revert the VMs back to a known state, boot them, install our software, and run an automated testing suite. Currently, we are having to rebuild beta VMs every time a new beta is dropped as it's becoming essentially impossible to do in-place updates of the beta OS on a VM :(. Given we need to make use of configuration profiles to ensure smooth operation of our solution, this is a laborious process and simply updating the OS in place would save us a lot of time and effort.

As per the other commenters above, the principal reason for running macOS in virtualized containers is to bypass the need to dual boot a machine to get access to a beta OS for testing software, which as a workflow is cumbersome and in reality completely impractical when also needing to be joining video conferences and conforming to corporate IT security policies. Please provide us with a solution for logging in to the App Store / other iCloud services from macOS VMs on Apple Silicon. I posted the above in this thread 9 months ago. The recent removal of seedutil from macOS requiring to be logged in to an Apple account for access to developer seed beta updates to macOS has now enormously impacted our workflow for automation testing of our EndpointSecurity product. We regularly run integration tests to exercise features of our EndpointSecurity product to validate that We have not introduced regressions in to our code macOS updates (especially beta udpates) haven't changed something that results in previously unexpected behaviour We are now in a position where we're going to have to completely rebuild our Apple Silicon based VMs used for integration testing every time a new beta build is released, this also means having to join said VM to our MDM, and handle any other manual setup tasks required (such as providing user-approval for screenrecording in PPPC so that our integration suite can capture screenshots should any integration tests fail etc) I am enormously frustrated by this. My original request in my post above stands - please, please provide a solution for logging in to iCloud accounts in Apple Silicon based VMs.