Changing from dev to standard edition causes "Could not obtain information about Windows NT group/user error code 0x6e."

Hello,

We recently upgrade our SQL Server 2012 SP1 (64bit) dev edition to standard edition, after we purchased the required licence and it was deployed in production.

Since the edition change, we are now receiving the following error, with some of our jobs, which have an e-mail step in them, which is causing the jobs to fail.

Msg 14661,Level 16, State 1, Procedure sp_send_dbmail, Line 517

Query execution failed: Msg 15404, Level 16, State 19, Server BL-SVR15, Line 1

Could not obtain information about Windows NT group/user 'BLUELIZARD\savaa', error code 0x6e.

Any ideas how to fix this issue? We were also having a similar error, when executing the jobs, but changing the job owner to SA has fixed this issue.

Thanks,

Andy.