Hi @itops_6398,
I'm very happy to hear that you got this working. You typically do not need the UPN because it will be automatically appended when searching for the user in your domain, but it doesn't hurt to be there. There are typically only two scenarios when the UPN is needed; when that username is already in the built-in directory or you have a multi-domain forest setup in Active Directory, then the UPN will tell it specifically where to look.
With all that said, if it is working for you now, then I would leave it as is because SAML and AD/LDAP are difficult enough as it is. We are going to add the transform information to our SAML docs in hopes of helping others later.
Thanks,
Dan