Did you follow the guidance noted in Do Not Use Pi Imager 1.9.4 - UPDATED and clear/reset/retype all of the previously saved customizations and reapply them? Those would include the WiFi SSID, password, and country.
There's not much to the asl3-update-nodelist.service. It simply executes the /usr/bin/asl3-update-nodelist script. The two issues I've seen relate to networking (DNS errors, internet connectivity) and file permissions (the files in /var/lib/asterisk should all be owned by "asterisk"). If you are still having issues it would be good to exec :
sudo -u asterisk bash -x /usr/bin/asl3-update-nodelist