WS2025 Preview (26100.1) fails to boot after joining WS2016 forest
I installed WS2025 Preview (Datacenter, 26100.1) in a virtual machine and after joining the domain, the box is rendered unbootable (boot loops). I can reinstall and do other tasks as a standalone server with no problem but joining the domain immediately bricks the VM, 100% of the time. The forest is running at functional level WS2016. I disabled all GPs and verified with gpresult they are not applied. Safe mode boots if you need me to poke around. Am working to get a kernel debugger attached. No memory dump is generated and disabling reboot on errors yields nothing.
Windows server 2025 Forest and Domain functional levels.
As many will no doubt have noticed, there is a 2025 forest and domain functional level introduced in build 25941. The schema updates suggest these are delegated managed service accounts (dMSA) and 32k pagesize for the active directory database. Is there any documentation on these?