Not sure why you would use TAP here rather than TUN (less 3G traffic). My early experience with TAP led me to go TUN and never look back.
But I’m not following how the OpenVPN server is configured. What is the server’s own LAN IP address? I’m guessing it is also 192.168.223.1? Might that be why you can get to 192.168.223.2 (if I follow you) and not .1?