How do I send Subject->NameID in "clear" text

[Jason Holland]

I am trying to get my Shib IdP to work with an SP that requires a phone
number instead of the username used to authenticate. I think I have it
setup to send the phone number instead of the username because I can see
the debug logs are saying that Shib is using the phone for the NameID.  

The SP has an example response where the NameID is in clear, human
readable text so my question is what setting do I change to make it to
where Shib sends the NameId as "clear" text in the response. I can't
find any documentation on this. Any hints?

Thanks,
Jason