Why is DNS via VPN not forwarding through micros?

Question

Domain Name System

Good afternoon!
There are 2 grids connected via VPN, there are micros on both sides
In the 1st grid there is an AD server with a raised DNS, on both micros this server is specified as DNS

But, it is not possible to ping a host from one network to another (by ip okay)
Help!
PS I know how to make the domain visible, but this is not the only problem, you need all hosts to ping by name

Answer 1

Not absolutely understood, DNS at the client registers, responds on ip but hosts do not resolve?
1. Check the availability of the vpn network from the DNS server by IP, maybe there are not enough routes
2. Check the firewall for DNS requests, and everywhere both on the server side and on the client side
3. /flushdns