OpenVPN client traffic issues

I have followed a setup on both this site and the Surfshark website to setup OpenVPN client on my device.

I can see in the system logs that the VPN is connecting and all my config files for the firewall / network / interfaces are all right according to this

When I then try any connection either direct from my client to an external address, or from my OpenWRT device to any address it is failing. Is there a common mistake I may be making?