IPSec DNS issue

I got two sites, 192.168.10.x 192.168.11.x

I need to use the DNS server which is inside the 10.x network from the 11.x network. I can access everything from each side, but when I set on the Mikrotik to set the DNS forwarder to the other network, it doesn’t work… am I missing something here?

Seems to be traffic from the router cannot get to the other site. How can I fix that?

More detailed info could help. Is it just one router with these two networks connected to it, or is it something more complicated (VPNs, …)? What about some firewall rules? Etc..