Hello there,
If you need to solve the update issue you can consider a reset or restore as this is a new device. You can try running the Troubleshooter to identify the issue
Select Start > Settings > System > Troubleshoot > Other troubleshooters. Next, under Most frequent, select Windows Update > Run.
To block only the notification check this article. https://support.microsoft.com/en-us/windows/change-notification-and-quick-settings-in-windows-ddcbbcd4-0a02-f6e4-fe14-6766d850f294
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