Join domain by DNS Forwarding

Hi!

We have deployed new Domain Controllers on the cloud. Because of company's policies, we must use public DNS for all our DNS querys, otherwise all querys get geo-located based of Azure's region.

The idea is to point each PC/Client DNS to our Firewall and use DNS Forwarding just to resolve internal names. 

The question is, would the DNS Forwarding allow or Clients to join the domain?

It's enough to resolve Domain Controller's IP to get the client joined to domain?

Or do I necessarily need to specify the IP of the Domain Controller in Client's DNS?

Thanks!!