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: -... (Budget: $30 - $250 USD, Jobs: Computer Repair, Microsoft, Microsoft Exchange, Microsoft Office, Microsoft Outlook, Technical Support, Troubleshooting)