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Azure Database Migration Service
An Azure service designed to help simplify, guide, and automate database migrations to Azure.
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Because Azure SQL Database is a fully managed PaaS, it does not expose underlying .bak files or transaction log streams. This rules out built-in online tools like the Managed Instance Link, Database Migration Service (DMS) continuous mode, or Log Replay Service (LRS) since all of them require native SQL transaction logs.
To accomplish an online migration for a database of this size without backup/restore, you would need to use a Logical Change-Data-Capture (CDC) or ETL-driven data sync approach.
For details, refer to https://oneuptime.com/blog/post/2026-02-16-how-to-migrate-from-azure-sql-database-to-azure-sql-managed-instance/view
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hth
Marcin