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.
- I have forgotten my Nokia account password
- How do I delete or remove my Nokia account?
- How can I report spam coming from a Nokia Mail account? (email@example.com or firstname.lastname@example.org)
- I forgot my Nokia account password for my Nokia Lumia. How do I recover my account?
- For what countries is Nokia Mail powered by Yahoo! supported?