Site to Site Sonicwall VPN -> Can't join main site domain from remote sites

- Can ping IP address of server from remote sites

- I've tried adding the server name -> IP in hosts file

- Can access share files on the server 

- EDIT: Also tried setting the DNS manually 

What changes would I need to make to the sonicwalls so that the remote sites can also join the domain?

Main Site is 192.168.0.X/23 (255.255.255.254.0

Other sites are 192.168.5.X/24 and 192.168.8.X/24

Thanks!