Hi AndreaCaldarone-7697,
Backups from a managed instance can only be restored to another managed instance. They cannot be restored to a SQL Server instance or to Azure SQL Database.
https://learn.microsoft.com/en-us/azure/azure-sql/managed-instance/sql-managed-instance-paas-overview#database-migration
As TiborKaraszi said, Using bacpac could be an option.But bacpac will also be challenging with 2 TB data.
some similar cases:
https://social.msdn.microsoft.com/Forums/en-US/c8b769cd-4724-46d7-81a3-ccf43bca9fce/azure-sql-managed-instance-backup-and-restore-on-local-sql-server?forum=ssdsgetstarted
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