Acho que esse problema só afeta os não PROS. Quem quer isto a funcionar tem de se tornar PRO
O problema já é conhecido e espera-se um update nos próximos meses.
Microsoft addressed the issue a few days later with a small update, but the issue has arrived yet again. The server-side bug is only affecting the Windows 10 Mobile devices as the People app continues to function properly in Windows 10 PCs with same Microsoft account.
Many users including the Insiders are complaining that they are having a sync problem again with the People app. Microsoft hasn’t acknowledged the problem yet, although it seems a fairly widespread issue.
There is a fix available but it is not working for all users. To fix the bug, you can sync the contacts in Microsoft People app. It’s worth noting that resetting the Windows Phone handset won’t address this issue.
Since Microsoft has already confirmed that Windows Phone’s feature and hardware is no longer the company’s focus, and as they don’t give Windows Phone users any priority these days, don’t expect a fix anytime soon. You can, however, report this bug on the Feedback Hub and let the team know about the ongoing issues.