How to deploy child domain under a child domain

Copper Contributor

I am trying to create child domain under a child domain. when I am trying to promote server as dc it is coming up as a invalid credentials. But when I am choosing tree sub domain option same credentials are working. I am using credentials of root domain. I am able to successfully create tree domain and under that a child domain. But I am having this problem when I trying to create a child domain under a child domain My network design is > (Child domain)> - sub domain this is where I am having trouble)

other side of  Network is ( which I have successfully created ) (root) > (tree domain) under that (child domain) I have successfully created that.

Attached is my network diagram


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