Sales Owner Fields?

[Jessica_Kao3]

Try 1) Data value changes and use constraint new value is "Veronica"

The sales owner field is tricky and not all logic works like it's suppose to. You can also try creating a smart list and referencing membership in a smart list. 

[Casey_Noland]

Are you sure these sfdc records are owned by a sfdc USER?

If the record belongs to a QUEUE, the 'Sales Owner' name and email fields will be blank in Marketo.

This makes sense as you wouldn't want to personalize an email as coming from or referencing "US Marketing Qualified Queue", etc. in an email.