Please create an Azure support request to better address this issue.
Disconnect AAD with my AD server
my AAD and AD sync is as usual but since my AD VM is corrupt, I can't get the AD schema back. Also I can't modify the on-premise account in admin portal unless i disconnect the AAD and AD. How can I get disconnected in order to get the on-premise account controllable?
it is better that the AAD team just initialize my AAD account so that i can quit this mess.