This issue is still unresolved.
In my case, I have a Wi-Fi network set to auto-connect, specifically for corporate use at my company.
At the login screen, Wi-Fi needs to be enabled to allow a domain user to log in.
From my perspective, the main problem lies with the operating system. It doesn’t start all necessary services at the login screen—only after a user logs in.
This creates a significant issue for domain users who rely on Wi-Fi for LDAP authentication.
I’m continuing to work on and search for a solution, but ultimately, the fix should come from Apple as a system update to address this problem.
I’m also experimenting with Apple Configurator and MDM to resolve UPN authentication as a workaround.
Feel free to share more ideas. Thanks!