We’ve made improvements to SQL Data Sync including PowerShell programmability, better security and resilience, enhanced monitoring and troubleshooting, and availability in more regions. As part of these changes, SQL Data Sync will only be available in the Azure portal beginning July 1, 2017. This blog post will cover the steps current active users will use to migrate to the new service. This only applies to customers that have used their Sync Groups after March 1, 2017.
If you are a new user that would like to try Data Sync, read more about it on the Azure blog.