Azure Active Directory
An Azure enterprise identity service that provides single sign-on and multi-factor authentication.
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I am using a ADDS servers from azure and configured Virtual Gateway for site to site access to my firewall. When i use a guest machine and tried to join it to the domain the global admin gets locked out and it wont allow me to join domain. I get the pop-up to enter the credentials to join the domain and when i enter my global admin credentials and i see a lock out message.
Have you added your admin user to the "Azure AD DC administrators" group in AAD? Users need to be a member of this to be an admin in AAD DS, it is not granted by default to AAD global admins.