Unable to find domain server for first time user

Here is the issue we have

1 New computer, no domain. Setup local admin account, installed zscaler, no problem to add the computer to AD domain. no issues to rdp servers or access network drive. (We blocked IP address access, only DNS name)

2 No problem to add a user to the new computer. or MDM user.

The issue is: I can’t let the new user login this computer. I keep the domain admin account alive and switch to another account, but always gives me the error: can’t find the domain server. I don’t have this issue with regular cisco VPN. The user is a new user, has no cache on this computer.

Which setting should I change?

Thanks,

Found the solution in FAQ.

Thanks