I am very sorry, I forget to continue with new Bangkok server.
End of Month processing distract me.
So now we can continue.
We feel it is better for you to have Server as Member server of AP Domain.
This way you have full control, just like any PC.
So it is better we rename this server so it does not have same as domain controllers name.
I suggest TH-BKK-SRV01
TH=Thailand
BKK= Bangkok
SRV01 = Server 01 (Perhaps you have better preferred name?)
Let me know if that name is OK or if you would like something different.
Or you can rename yourself
I will then connect it to the domain and move it into to AD.Thailand OU