I Ran into this issue also with a Single host after I shut it down in Maintenance Mode to move it to a new power supply completely. When I powered it back up I could not login with the root account to the vSphere Client (no vCenter). I was able to ssh to the client and even after restarting all agents and rebooting the host a second time I could not login. However I was finally able to login with AD credentials domain\user password without any issues. Weird as all my VMs including the AD servers were offline on the host, but it worked. Hope this helps!
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