Follow these steps to troubleshoot issues with email account syncing:

1. Double-check email server settings and logon information
2. Verify that all applicable POP/IMAP and SMTP ports are open and accessible
3. Ensure that you are using the correct email address for the account
4. Verify that the server and/or account accept SSL communication
5. Ensure that two-factor authentication settings are correctly configured
6. Make certain that the account has not been locked or suspended
7. Check any VPN settings for compliance with email server port settings