Mmm, I disagree.

The SQL Agent proxy account is a windows account in wich non sysadmin SQL users will use to access OS and network resources, by running xp_cmdshell or jobs.

All sysadmin users, use the account that start the SQL agent service, the non sysadmin will use that account. But I don't think that it need acces to SQL.

Anyway, the account has access to SQL but still isn't working.

Can't figure out why.