How to configure VPN correctly

hey guys, I have a question. I monitor cameras that are outside of my local network via app (Dahua) as well as I do remote work using Remotix. If I connect to VPN from my computer with tunnelblick app everything works fine and I can access cameras as well as remote desktops. Now I just started using openwrt router with openvpn set up to connect to VPN. With VPN connected I can access internet and everything is accessible but not my cameras and Remotix....It seems I can connect to some degree where I can see remote cameras or remote desktops on the remote desktop app or remote cam app but the last step to do the final connection is blocked. Any ideas what I am missing here? Any advice is appreciated!