LoggedInRegularUser.OC_Emails=LIST_LINE(FIND Personnel WHERE Personnel.Roles CONTAINS 'OC',``,;,;,EmailAddress)
Use the key to the left of the #1 key.
Also, that FIND can be replaced by a saved Query, and doesn't have to be a literal string:
LoggedInRegularUser.OC_Emails=LIST_LINE( Q_Personnel_OC,``,;,;,EmailAddress)