Fix Outlook 2019 Mail Sync Issue

I need help fixing Outlook 2019 after a Windows 11 reinstall. My .pst files are intact, but my mailboxes won't update—neither manually nor automatically. I can see new messages online.

Requirements:
- Repair Outlook 2019 functionality
- Ensure mailboxes sync correctly
- Troubleshoot after Windows 11 reinstall

Ideal Skills:
- Expertise in Outlook and Windows 11
- Experience with .pst file handling
- Strong troubleshooting skills