Backup Exec 2014 cannot connect to SQL database

I have installed BackupExec 2014 and attempting to perform a full backup which includes my SQL database instance. When I "test/edit credentials" for the backup job and Test All, my SQL database shows "Test failed, Test recommended". I am unable to change the logon setting because it is greyed out with "user server's logon account". If I change the server's logon account the test still fails.
I'm not sure what account it wants.
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Ensure that the Windows user account that you use to back up the SQL instances has System Administrator privileges.

    Ensure that Backup Exec has rights to the following registry keys:

        HKEY_LOCAL_MACHINE\Software\Microsoft\Microsoft SQL Server


Please check below link for same.

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ClintonKAuthor Commented:
Thanks. All to do with the user that BackupExec was running under. As a test I changed the user to the system administrator and everything then burst into life. Now I know what the cause is I can configure the backup user correctly.
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