Cannot logon after system recovery
After using System Recovery on my Mac Studio to reinstall macOS Tahoe, the login progress bar only advances a short way and login finally gives up after a few minutes.
Mac Studio, macOS 26.1
See this Apple article:
If your Mac starts up to an Apple logo or progress bar - Apple Support
FYI, here is another Apple article with other startup issues just in case you need it for a different issue in the future:
If your Mac doesn't start up all the way - Apple Support
Also, it is usually a good idea to mention the exact model of your device when asking for assistance online since we may have ideas of likely hardware causes such as a failing Hard Drive. You can get the exact model by clicking the Apple menu and selecting "About This Mac", or if the Mac is not booting, then enter the system serial number on the Apple check coverage page here, but please don't post the serial number on the forum since it is considered personal information:
View Coverage - AppleCare & Warranty