Hi Higor,  When setting up the functional account you can select an individual domain controller or “any” domain controller.  This would allow you to specify a RWDC vs letting DNS choose one.  

Here’s a link to a KB article that explains the configuration.  https://beyondtrustcorp.service-now.com/csm?id=kb_article_view&sysparm_article=KB0020398

Yes, but for any reason it is taking back to ANY instead of keeping the DC I selected. Also, is there a way to force my Resource Broker always to use ONE DC?

I am not aware of a way to force the resource broker to use one DC.  That would be worth a support ticket unless someone in this group knows the answer.

Tks Michael, I have added my preferred DC in hosts file in my RB. Lets see how it goes. Thaks a lot.