Solved!
Followed a lot of rabbit holes down until I found these:
https://serverfault.com/questions/1064935/openvpn-server-connexion-ok-but-no-access-to-remote-lan
which lead to:
https://openvpn.net/community-resources/how-to/#expanding-the-scope-of-the-vpn-to-include-additional-machines-on-either-the-client-or-server-subnet
Main take away was that I needed to add
push "route [Local LAN subnet] 255.255.255.0"
to the advanced configuration on the server setup.
Still reading a bit more to understand how this worked, but I'm able to ping my local machine as well as remote into it.
Happy days.
