Hello there cp3654,
Thanks for posting in the Apple Support Communities!
While we understand you've taken some steps already, check out the following resource to see if any of the steps listed will clear this up: If you can't connect or sign in to iCloud
If those steps aren't helpful, let's be sure you're up to date with the latest macOS version to see if that's related. Check out the steps below for assistance with this, and more information can be found here: Update macOS on Mac
Before you get started, it's a good idea to back up your Mac. Then follow these steps to find and install any available software updates or upgrades.
1. From the Apple menu in the corner of your screen, choose System Preferences.
2. In the System Preferences window, click Software Update.
If your System Preferences doesn't include Software Update, learn how to upgrade to macOS Monterey or upgrade to an older macOS, and use the Updates tab of the App Store app to get app updates.
3. Click Update Now or Upgrade Now:
• Update Now installs the latest updates for the currently installed version, such as an update from macOS Big Sur 11.5 to macOS Big Sur 11.6.
• Upgrade Now installs a major new version with a new name, such as macOS Monterey. Software Update shows only upgrades that are compatible with your Mac.
If that isn't helpful, let us know which macOS version you're experiencing this with. Also let us know if this continues while connecting to a different Wi-Fi network.
Have a great day!