Announcing GA of the link feature for Azure SQL Managed Instance for SQL Server 2016 and 2019

Mxaris - Only partially. You can build MI link on the FCI cluster primary server. However, on the FCI failover, the link will not continue replication on the new primary server. Therefore you can perhaps use it as a temporary solution to replicate data from the primary to Azure, however as a solution that fully works with FCI failover - it won't work. On the other hand, MI link fully supports Always On tech., so if you have an on-prem. AG with multiple nodes and are using the listener endpoint, in case of the failover, the link will continue working seamlessly with Azure. For the full disclosure - we don't require customers to have an existing AG on the SQL Server as the link could be setup on a single node system as well, and without WSFC. Hope this helps.