Same issue, not a fix but you can bypass setup by removing the apk file in /system/priv-app/SetupWizard folder.Did you ever get it working? Having the same issues as you.
I want to try again but I've already set up OOS 10 and I don't want to waste my time reflashing everything yk?
Reboot to recovery (twrp) mount system then either using adb from PC or file manager in twrp remove the file and reboot
Then you can start omni, either add account in settings or run play store and login. You will need to do equivalent steps of setup wizard such as WiFi, pin etc