Similar to https://community.morsemicro.com/t/bridge-mode-ap-lost-connection/46/14
But on the latest firmware built from openwrt repo there is a wizard option to select bridge mode. After setting it no longer had access to web UI.
Edit:
Managed to fix my issue by changing my network settings:
Then doing nmap -sn 10.42.0.0/16
to see what IP the device was assigned.
Starting Nmap 7.95 ( https://nmap.org ) at 2024-09-20 16:20 AEST
Nmap scan report for mma-spare (10.42.0.1)
Host is up (0.00020s latency).
Nmap scan report for 10.42.0.203
Host is up (0.00068s latency).
Nmap done: 65536 IP addresses (2 hosts up) scanned in 27.06 seconds
So then going to http://10.42.0.203/cgi-bin/luci/ worked