An Azure relational database service.
As you can read on this Microsoft documentation, MBAM only supports Microsoft SQL Server 2008 R2 or later versions (up to SQL Server 2019). 64-bit versions of SQL Server. For a standalone topology, the SQL Server box needs to have a minimum 2.33 GHz or greater processor, 12 GB of RAM and 5 GB of storage. For a Configuration Manager Integration topology, 8 GB of RAM is the minimum,
SQL Azure Database is not supported by MBAM.