It appears the docker proxies never open their ports, and thus I cannot connect to any apps. Thankfully the GUI and SSH works. FWIW I upgraded whilst connected via a VPN.
Worked fine before 1.5 upgrade.
I found a fix here: [UmbrelOS 1.5] Missing iptables FORWARD rules on umbrel_main_network breaks all app connectivity on Raspberry Pi 5 · Issue #2101 · getumbrel/umbrel · GitHub