One possible reason is that Contacts will not be synced if you have not indicated your date of birth on your Nokia account. Ensure you have specified your date of birth and that you are older than 13.
- Why does Nokia email underline phone numbers in my e-mails?
- Can I log into other Yahoo services with my Nokia ID?
- What is a direct POP/IMAP email connection?
- Can I send and receive phone calls on my Nokia device while Nokia Email client is synchronizing new email?
- How can I create a new Nokia account on my Lumia?