Executed as user: ADMIN\abc-SQLServer. Linked servers cannot be used under impersonation without a mapping for the impersonated login. [SQLSTATE 42000] (Error 7437). The step failed.

Hi All, 

We have verified permissions on both sides,current server and linked server, the user has sysadmin.

Another key piece of information is that this is happening when executing a SQL Job.

Thanks.