RESTORE DATABASE [xxx]
    FROM URL = 'https://<account-name>.blob.core.windows.net/<container-name>/<filename>.bak'

Msg 1801, Level 16, State 1, Line 1
Database 'xxx' already exists. Choose a different database name.
Msg 3013, Level 16, State 1, Line 1
RESTORE DATABASE is terminating abnormally.

Msg 41901, Level 16, State 2, Line 1
One or more of the options (replace) are not supported for this statement in SQL Database Managed Instance. Review the documentation for supported options.