MacOS update failed because of user authentication failure
What causes it and how to solve it?
Question marked as
User profile for user:
Eric_G1
User level:
Community Specialist
Hello meindert33,
It looks like you may have come across it but this page can provide assistance for errors with installing macOS updates: If an error occurred while updating or installing macOS - Apple Support
More info on each step can be found on the page, but it'll help to cover the following suggestions:
1. Check your internet connection
2. Install in safe mode
3. Install after repairing your disk
4. Install from macOS Recovery
5. Install after erasing your Mac
If you're using a VPN or security/networking apps, try temporarily uninstalling these for the moment to help rule out any conflicts.
If the issue pertains to your Admin password, this page can help with that: If you forgot your Mac login password
Cheers.