I am trying to synchronise databases in two different subscriptions using Azure datasync on the new portal
https://docs.microsoft.com/en-us/azure/sql-database/sql-database-get-started-sql-data-sync
On the portal, I do not get the ability to choose subscription or connection string to connect to a Azure database on a different subscription (this is not on premise)
The options presented are either
a) Database from existing subscription + database server
b) on-premise database- with a sync agent to be downloaded
Can linking to another database via connection string be implemented via API's or is there any restriction or feature limitation around this?