How can I set Sensitivity in an email that I'm sending from an Excel VBA Macro?

I need to send emails with a confidential tag. Our in-house custom tag is "Patient-Confidential", there is no "Confidential" under "Sensitivity" but "Patient-Confidential" is the 3rd item on the "Confidential" drop-down list if that has anything to do with it. The default Outlook tag for confidential is .Sensitivity=3, but it doesn't change the sensitivity at all. How can I assign sensitivity, either MS Outlook "Confidential" or "Patient-Confidential"?

I've successively tried all of the following variations for assigning sensitivity:

With OutMail
.To = recipient
.Subject = strsubject
.Body = strbody
.Sensitivity = "Patient-Confidential" 'to match the sensitivity status
.Sensitivity = 3
.oLSensitivity = 3
.oLSensitivity = confidential  'and olconfidential
.oLSensitivity = sensitivity.olConfidential 
.Display
End With