cant sync my calendar

Hello reccek,

This page can help provide some steps that can assist with getting iCloud Calendar set up on your PC: Set up iCloud Mail, Contacts, and Calendar in Outlook on your Windows computer - Apple Support

Set up iCloud Mail, Contacts, and Calendar in Outlook on your Windows computer

You can view your iCloud mail, contacts, and calendar in Microsoft Outlook.

Before getting started, make sure you’ve set up an @icloud.com email address. See Create a primary email address for iCloud Mail in the iCloud User Guide.

1. On your Windows computer, open iCloud for Windows.

2. To set up Contacts and Calendar, select “Contacts and Calendars,” click Apply, then follow the onscreen instructions to set up Outlook.

3. Note: If you see “Mail, Contacts, and Calendars,” selecting that option also sets up your iCloud Mail account.

4. To set up Mail, sign in to Outlook using your Apple ID email address and an app-specific password. See the Apple Support article Using app-specific passwords.

If the above steps haven't helped then this link will have various suggestions that can assist with resolving that: If you can’t add iCloud Mail, Contacts, or Calendars to Outlook - Apple Support

Cheers.