SQL Server 2014 login failed

Hi @chris_ahn 

Please have a read of: https://docs.microsoft.com/en-us/sql/relational-databases/errors-events/mssqlserver-18456-database-engine-error?view=sql-server-ver15 

This outlines the failure and what you need to do / find out more info. 

Additionally, support can gain access to the Commvault instance using an inbuilt local account (for emergencies). You’ll need to raise a support case to get this assistance however.