After macOS Tahoe Update: Notifications, Siri, and Widgets Not Working

I just updated my MacBook Pro Max to macOS Tahoe, but now I can’t access my notifications. Siri doesn’t respond, even when I click on the icon at the top, and I’m unable to add widgets or find my old ones on the desktop. I’ve restarted the laptop several times, but nothing changed. I also checked the settings for notifications and Siri, and both are enabled. I think this might be a macOS software bug.