Joining Active directory Domain Controller in other office

we have our main office which the the active directory domain is currently we are using PEPLINK sdwan to our main office and our branch offices to connect via speed fusion vpn my concern is when I’m trying to join a domain in our branch office i failed to contact or connect or join the domain. when in our main office network can have successfully connected but in our branch office cannot can you help me to do that we are using windows server 2016 server

What is the DNS server set to in your branch office? If it’s anything but your AD that’s your problem.

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i set a dns server base in our main office Active directory