if you really want to run OB2 within your Windows 11 VM, you need to install dotnet in your vm
you can get it here.
Use the Windows Arm64 Core Runtime Installer
But i’d recommend this only if you really want to have it in an isolated environment or cause you want to run the native version.
Else i would recommend to run the webclient outside of the VM.
Just follow this guide https://discourse.openbullet.dev/t/how-to-download-and-start-openbullet-2
Use there the MacOS Arm64 version.